Thanks for your help Tobias! I’ve got it working again.
For the record, I found an entry in the PYTHONPATH environment variable that I missed when Uninstalling a previous version of PY3.10. That by itself didn’t fix the problem, but may have affected the Scipy install.
So I uninstalled Obspy, Cartopy and Scipy and then reinstalled Scipy in the base environment.
I then created a new environment for Obspy and Cartopy and it’s all working now.
Thanks again!
Al.