The spreadsheet below corrects the errors in the original versions I posted as a response yesterday. Have also, hopefully, improved the spreadsheet! The entries are sorted by Region, Area, PCO and Practice. I have included Liothyronine, Cytomel, Nature-Throid, Erfa and Armour in the single spreadsheet.
Data relates to the start of 2014.
The spreadsheet is in Excel xlsx format - which most modern spreadsheet programs can open. It is entirely plain text inside - nothing fancy at all.
All this data (and more) is readily available to anyone with a typical modern computer, and suitable software (which can be available without any charge - e.g. LibreOffice).
(This data is for England only. Any volunteers to do Cymru, Alba, and NI?)