Fully concur with you Adrian regarding the Tannoys. Once bitten never forgotten (mixing metaphors!).
My first entry to Tannoys were via Eatons and I knew going larger would be more of the same - but larger. So when an unrestored pair of Berkeleys came up I grabbed them (and restored them). You are 100% correct, they have the same sound signature - just more scale for the larger ones. I've been switching between them and same signature. Happy with both and even the larger Tannoys work just fine in a medium size room.