diff --git a/notebooks/PET/reconstruct_measured_data.ipynb b/notebooks/PET/reconstruct_measured_data.ipynb
index 510c2c7..5626a72 100644
--- a/notebooks/PET/reconstruct_measured_data.ipynb
+++ b/notebooks/PET/reconstruct_measured_data.ipynb
@@ -113,11 +113,16 @@
     "# umap.v.hdr is the output converted file\n",
     "# Also copy the normalisation header for modification below (using a shorter name).\n",
     "!cp $data_path/20170809_NEMA_UCL.n.hdr norm.n.hdr\n",
-    "!convertSiemensInterfileToSTIR.sh $data_path/20170809_NEMA_MUMAP_UCL.v.hdr umap.v.hdr\n",
+    "# copy to writeable location (https://github.com/UCL/STIR/issues/1600)\n",
+    "!cp $data_path/20170809_NEMA_MUMAP_UCL.v.hdr tmp_umap.v.hdr\n",
+    "!convertSiemensInterfileToSTIR.sh tmp_umap.v.hdr umap.v.hdr\n",
+    "!rm tmp_umap.v.hdr\n",
     "\n",
     "# These files will sometimes have lines terminated with CR instead of CRLF, fix this\n",
     "# This just means, if we see CR<character> and <character> isn't LF, replace it with CRLF<character>\n",
     "!sed -i.bak \"s/\\r\\([^\\n]\\)/\\r\\n\\1/g\" norm.n.hdr\n",
+    "# copy to working directory (https://github.com/UCL/STIR/issues/1601)\n",
+    "!cp $data_path/20170809_NEMA_UCL.n .\n",
     "!sed -i.bak \"s/\\r\\([^\\n]\\)/\\r\\n\\1/g\" umap.v.hdr\n",
     "\n",
     "# Now add absolute data path to the header file\n",