Edit install instructions and env .yml (#488)

Author: lauramurgatroyd

README.md

@@ -10,22 +10,25 @@ A simple interactive viewer based on VTK classes and written in Python.
 Examples of QApplications are the [`iviewer`](Wrappers/Python/ccpi/viewer/iviewer.py) and the [`standalone viewer`](Wrappers/Python/ccpi/viewer/standalone_viewer.py). An example of use in an external software is [iDVC](https://github.com/TomographicImaging/iDVC).
 
 ## Installation instructions
-To install via `conda`, create a **minimal** environment using:
+We recommend installing with additional requirements needed to run the [UI utilities](Wrappers/Python/ccpi/viewer/ui) for embedding the viewer in Qt applications. These include `eqt>=2.0.0` and one Python-Qt binding, such as `PySide2`, `PySide6` or `PyQt5`. The [UI examples](Wrappers/Python/examples/ui_examples) require `cil-data` as well. 
 
-```bash
-conda create --name cilviewer ccpi-viewer=25.0.0 -c ccpi -c conda-forge
+To install via `conda`:
+```sh
+conda env create --file Wrappers/Python/conda-recipe/ui_env.yml
 ```
-### Qt embedding
+This will install `PySide2` but you could edit the `.yml` to use a different Python-Qt binding.
 
-To embed the viewer in Qt applications we provide extra [UI utilities](Wrappers/Python/ccpi/viewer/ui). To use those, the environment needs to include the extra requirements `eqt>=2.0.0` and one Python-Qt binding, such as `PySide2`, `PySide6` or `PyQt5`. The [UI examples](Wrappers/Python/examples/ui_examples) require `cil-data` as well. 
+### Minimal Version
+Alternatively, to create a **minimal** environment without the requirements for the UI utilities use:
 
-The environment can be updated to include these (`pyside2`) dependencies as follows:
-```sh
-conda env update --name cilviewer --file Wrappers/Python/conda-recipe/ui_env.yml
+```bash
+conda create --name cilviewer ccpi-viewer=25.1.0 -c ccpi -c conda-forge
 ```
 
 ## Run the standalone viewer QApplication
 
+Note: this needs the additional UI requirements (recommended installation above).
+
 - Activate your environment using: ``conda activate cilviewer``.
 - Launch by typing: `cilviewer`
 - Load a dataset using the File menu. Currently supported data formats:

Wrappers/Python/conda-recipe/ui_env.yml

@@ -1,5 +1,6 @@
-name: cilviewer
+name: cilviewer_ui
 dependencies: 
+    - ccpi::ccpi-viewer=25.1.0
     - conda-forge::pyside2
     - conda-forge::eqt>=2.0.0
     - ccpi::cil-data=22.0.0