Hello Branwen,
Druids are awkward because they left no writings of their own, and many later people had strange ideas about them - most of them probably very romantic.
With regard 'Druids's Temple' : People of all ages a.d. have stuck fanciful names onto pre-historic sites they didn't understand. In N. Yorks., we have a Danes' Dyke which predates the Danish invasion by at least 1,000 years. A lot of old henges - Studford Ring (N. Yorks) and Maiden's Grave (E. Yorks) for example - were called 'stud folds' in medieval cartularies, too, quite ignoring the fact that a crippled donkey could be out of them in seconds. You can't rely on any of them.
A brief commentary on recent thinking about Druids can be found in the Blog section - 'Druid, Druid, wherefore art thou'. Quite amusing - just shows how a serious debate lasting 180 years could all be started by a mis-classification! Ha, what a wonderful world.