diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index e69de29b..d231ead8 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -0,0 +1,4 @@
+- bump: patch
+  changes:
+    fixed:
+    - Added more log messages.
diff --git a/policyengine/outputs/macro/comparison/calculate_economy_comparison.py b/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
index bc53044c..7e6457da 100644
--- a/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
+++ b/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
@@ -11,6 +11,9 @@
     SingleEconomy,
 )
 from typing import List, Dict, Optional
+import logging
+
+logger = logging.getLogger(__file__)
 
 
 class BudgetaryImpact(BaseModel):
@@ -809,7 +812,9 @@ def calculate_economy_comparison(
     if not simulation.is_comparison:
         raise ValueError("Simulation must be a comparison simulation.")
 
+    logging.info("Calculating baseline econonmy")
     baseline: SingleEconomy = simulation.calculate_single_economy(reform=False)
+    logging.info("Calculating reform economy")
     reform: SingleEconomy = simulation.calculate_single_economy(reform=True)
     options = simulation.options
     country_id = options.country
@@ -835,6 +840,7 @@ def calculate_economy_comparison(
     )
 
     if simulation.options.include_cliffs:
+        logging.info("Calculating cliff impacts")
         cliff_impact = CliffImpact(
             baseline=CliffImpactInSimulation(
                 cliff_gap=baseline.cliff_gap,
@@ -848,6 +854,7 @@ def calculate_economy_comparison(
     else:
         cliff_impact = None
 
+    logging.info("Comparison complete")
     return EconomyComparison(
         model_version=simulation.model_version,
         data_version=simulation.data_version,
diff --git a/policyengine/simulation.py b/policyengine/simulation.py
index 551bae3a..a22038fd 100644
--- a/policyengine/simulation.py
+++ b/policyengine/simulation.py
@@ -33,6 +33,9 @@
 from typing import Callable
 import importlib
 from policyengine.utils.data_download import download
+import logging
+
+logger = logging.getLogger(__file__)
 
 CountryType = Literal["uk", "us"]
 ScopeType = Literal["household", "macro"]
@@ -102,10 +105,14 @@ def __init__(self, **options: SimulationOptions):
         if not isinstance(self.options.data, dict) and not isinstance(
             self.options.data, Dataset
         ):
+            logging.debug("Loading data")
             self._set_data(self.options.data)
+            logging.info("Data loaded")
         self._initialise_simulations()
+        logging.info("Simulations initialised")
         self.check_data_version()
         self._add_output_functions()
+        logging.info("Output functions loaded")
 
     def _add_output_functions(self):
         folder = Path(__file__).parent / "outputs"
diff --git a/policyengine/utils/data/caching_google_storage_client.py b/policyengine/utils/data/caching_google_storage_client.py
index bfb1b1ff..dc9dd8f5 100644
--- a/policyengine/utils/data/caching_google_storage_client.py
+++ b/policyengine/utils/data/caching_google_storage_client.py
@@ -50,9 +50,15 @@ def download(
                 f"Copying downloaded data for {bucket}, {key} to {target}"
             )
             atomic_write(target, data)
+            logger.info(
+                f"Data successfully copied to {target} with version {version}"
+            )
             if return_version:
                 return version
             return
+        logger.error(
+            f"Cached data for {bucket}, {key}{', ' + version if version is not None else ''} is not bytes."
+        )
         raise Exception("Expected data for blob to be cached as bytes")
 
     # If the crc has changed from what we downloaded last time download it again.
@@ -68,22 +74,22 @@ def sync(
         crckey = f"{bucket}.{key}.{version}.crc"
 
         crc = self.client.crc32c(bucket, key, version=version)
+        id_string = (
+            f"{bucket}, {key}{', ' + version if version is not None else ''}"
+        )
         if crc is None:
-            raise Exception(f"Unable to find {key} in bucket {bucket}")
+            raise Exception(f"Unable to find {id_string}")
 
         prev_crc = self.cache.get(crckey, default=None)
-        logger.debug(f"Previous crc for {bucket}, {key} was {prev_crc}")
+        logger.debug(f"Previous crc for {id_string} was {prev_crc}")
         if prev_crc == crc:
-            logger.info(
-                f"Cache exists and crc is unchanged for {bucket}, {key}."
-            )
+            logger.info(f"Cache exists and crc is unchanged for {id_string} .")
             return
-
         [content, downloaded_crc] = self.client.download(
             bucket, key, version=version
         )
-        logger.debug(
-            f"Downloaded new version of {bucket}, {key} with crc {downloaded_crc}"
+        logger.info(
+            f"Downloaded new version of {id_string} with crc {downloaded_crc}"
         )
 
         # atomic transaction to update both the data and the metadata
@@ -94,6 +100,7 @@ def sync(
             # Whatever the CRC was before we downloaded, we set the cache CRC
             # to the CRC reported by the download itself to avoid race conditions.
             self.cache.set(crckey, downloaded_crc)
+        logger.info("Cache updated for {id_string}")
 
     def clear(self):
         self.cache.clear()
diff --git a/policyengine/utils/data/simplified_google_storage_client.py b/policyengine/utils/data/simplified_google_storage_client.py
index f15f337b..b7d80df0 100644
--- a/policyengine/utils/data/simplified_google_storage_client.py
+++ b/policyengine/utils/data/simplified_google_storage_client.py
@@ -19,27 +19,31 @@ def __init__(self):
         self.client = Client()
 
     def get_versioned_blob(
-        self, bucket: str, key: str, version: Optional[str] = None
+        self, bucket_name: str, key: str, version: Optional[str] = None
     ) -> Blob:
         """
         Get a versioned blob from the specified bucket and key.
         If version is None, returns the latest version of the blob.
         """
-        bucket = self.client.bucket(bucket)
+        bucket = self.client.bucket(bucket_name)
         if version is None:
             return bucket.blob(key)
-        else:
-            versions: Iterable[Blob] = bucket.list_blobs(
-                prefix=key, versions=True
-            )
-            for v in versions:
-                if v.metadata is None:
-                    continue  # Skip blobs without metadata
-                if v.metadata.get("version") == version:
-                    return v
-            raise ValueError(
-                f"Could not find version {version} of blob {key} in bucket {bucket.name}"
-            )
+        logging.debug(
+            "Searching {bucket_name}, {prefix}* for version {version}"
+        )
+        versions: Iterable[Blob] = bucket.list_blobs(prefix=key, versions=True)
+        for v in versions:
+            if v.metadata is None:
+                continue  # Skip blobs without metadata
+            if v.metadata.get("version") == version:
+                logging.info(
+                    f"Blob {bucket_name}, {v.path} has version {version}"
+                )
+                return v
+        logging.info(f"No version {version} found for {bucket_name}, {key}")
+        raise ValueError(
+            f"Could not find version {version} of blob {key} in bucket {bucket.name}"
+        )
 
     def crc32c(
         self, bucket_name: str, key: str, version: Optional[str] = None
@@ -51,7 +55,7 @@ def crc32c(
         blob = self.get_versioned_blob(bucket_name, key, version)
 
         blob.reload()
-        logger.debug(f"Crc is {blob.crc32c}")
+        logger.info(f"Crc for {bucket_name}, {key} is {blob.crc32c}")
         return blob.crc32c
 
     def download(
@@ -60,10 +64,15 @@ def download(
         """
         get the blob content and associated CRC from google storage.
         """
-        logger.info(f"Downloading {bucket}, {key}")
+        logger.debug(
+            f"Downloading {bucket}, {key}{ ', version:' + version if version is not None else ''}"
+        )
         blob = self.get_versioned_blob(bucket, key, version)
 
         result = blob.download_as_bytes()
+        logger.info(
+            f"Downloaded {bucket}, {key}{ ', version:' + version if version is not None else ''}"
+        )
         # According to documentation blob.crc32c is updated as a side effect of
         # downloading the content. As a result this should now be the crc of the downloaded
         # content (i.e. there is not a race condition where it's getting the CRC from the cloud)
@@ -74,11 +83,25 @@ def _get_latest_version(self, bucket: str, key: str) -> Optional[str]:
         Get the latest version of a blob in the specified bucket and key.
         If no version is specified, return None.
         """
+        logger.debug(f"Getting latest version of {bucket}, {key}")
         blob = self.client.get_bucket(bucket).get_blob(key)
+        if blob is None:
+            logging.warning(f"No blob found in bucket {bucket} with key {key}")
+            return None
+
         if blob.metadata is None:
             logging.warning(
-                "No metadata found for blob, so it has no version attached."
+                f"No metadata found for blob {bucket}, {key}, so it has no version attached."
+            )
+            return None
+
+        version = blob.metadata.get("version")
+        if version is None:
+            logging.warning(
+                f"Blob {bucket}, {key} does not have a version in its metadata"
             )
             return None
-        else:
-            return blob.metadata.get("version")
+        logging.info(
+            f"Metadata for blob {bucket}, {key} has version: {version}"
+        )
+        return blob.metadata.get("version")
diff --git a/policyengine/utils/data_download.py b/policyengine/utils/data_download.py
index 2bf60387..3f33fbf7 100644
--- a/policyengine/utils/data_download.py
+++ b/policyengine/utils/data_download.py
@@ -12,14 +12,14 @@ def download(
     gcs_bucket: str,
     version: Optional[str] = None,
     return_version: bool = False,
-) -> Tuple[str, Optional[str]]:
+) -> Tuple[str, str] | str:
     logging.info("Using Google Cloud Storage for download.")
-    version = download_file_from_gcs(
+    downloaded_version = download_file_from_gcs(
         bucket_name=gcs_bucket,
         file_name=filepath,
         destination_path=filepath,
         version=version,
     )
     if return_version:
-        return filepath, version
+        return filepath, downloaded_version
     return filepath
diff --git a/policyengine/utils/google_cloud_bucket.py b/policyengine/utils/google_cloud_bucket.py
index 19f2f5ac..a7cc6842 100644
--- a/policyengine/utils/google_cloud_bucket.py
+++ b/policyengine/utils/google_cloud_bucket.py
@@ -2,7 +2,7 @@
 import asyncio
 from pathlib import Path
 from google.cloud.storage import Blob
-from typing import Iterable
+from typing import Iterable, Optional
 
 _caching_client: CachingGoogleStorageClient | None = None
 
@@ -24,8 +24,8 @@ def download_file_from_gcs(
     bucket_name: str,
     file_name: str,
     destination_path: str,
-    version: str = None,
-) -> str:
+    version: Optional[str] = None,
+) -> str | None:
     """
     Download a file from Google Cloud Storage to a local path.
 
@@ -38,10 +38,11 @@ def download_file_from_gcs(
         version (str): The version of the file that was downloaded, if available.
     """
 
-    return _get_client().download(
+    version = _get_client().download(
         bucket_name,
         file_name,
         Path(destination_path),
         version=version,
         return_version=True,
     )
+    return version