This website (openprescribing.net) popped up on my Twitter feed and it's really interesting. It is interactive, inasmuch as one can search by all or individual CCG/s or GP Practice/s to find out what their levels of prescribing are for any drug.
This link is for my own CCG for Liothyronine for January 2017:
openprescribing.net/analyse...
Have fun