_TMS_ said:All of the temples (so far found of course) dating from the Roman occupation of Britain are Mithraic (from the Temple of Mithras in old London town, all the way up to Hadrian's wall)[...]
I'd question that assertion - there are several temples from that period for which we have no definite dedication, or the dedication is derived from archaeological evidence. For example, not far from Cerne Abbas (across the border in Somerset) there's what's thought to be a temple dedicated to Mars. There are other temple sites across the UK of Romano-British date that are also possibly dedicated to gods other than Mithras.