I have been monitoring 335 prices for a few months now, and have seen many units as im searching for one as well.
the main diffrence u have to look out for is
- YOM
- real milege (dun trust the meter, get it checked out at trusted workshop)
- idrive
- logic 7 sound system
- full M-sport or just M-sport parts
265k is quite high for a registered 06....you can easily find unreg 06 for 240-255k, plenty listed on mudah
traditionally japan spec is better as theres less corrosion/winter damage...but its better to go with your gut..if it looks good and feels good, it doesnt matter if its UK/jap spec
gd luck with your search...damn hard to find one thats to your liking, budget with the right exterior/interior colour combo