Hi Rhiannion, just borrowed Wedlake's Excavation of Apollo at Nettleton book-1930s, good photos of a lot of the stuff that remained intact, several temples, the first probably iron age (Dobunni). Might be a copy at the library.
To return to the thread Ann Ross's Pagan Celtic Realms is good on the interweaving of roman and pagan gods, and of course the other person who is an expert Miranda Green, Gods of the Celts....