Currently, I believe that a GOOD and WELL DESIGNED 8" main driver crossing over to a modern wide-band tweeter (lower frequencies as well as super-sonic) can give splendid results in UK sized rooms and the two-cubic-foot box arrangement as used in various BBC-related models proves this I believe. Interestingly, the Spendor SP1/2 series, Harbeth SHL5 and Stirling LS3/6 (the first and last fairly closely related I reckon, since they share the same designer). Their ancestors (Spendor BC1 and Rogers equivalents) had no lack of stereo image precision either, so careful and thorough was the design IMO.
The vociferous trend from Gloucestershire towards smaller actives (you know who I'm referring to) is as much to do with what thirty something couples wish to live with in their domestic environments as much as any theoretical advantage in tiny drivers. My old BC2's are frankly, hideous lumps that dominate the room along with the old CRT telly we still use. I expect that when the TV goes home and is replaced with a modern flat model, the Spendors will have to go, and I shall fight to my last breath not to have to go tiny (and I'll probably lose miserably in the process)...