Since the installer knew that I had a UK keyboard, I think that it should have guessed a related timezone -- Europe/London would seem sensible. Similarly, it should have selected and defaulted en_GB in the "Which languages do you want" screen. I understand that this is done based on language, but surely it could be extended to consider keyboard types, etc.
deferred until next release.
I don't see much to gain by doing this. I think selecting timezone by language makes as much sense as anything else.