17. you're having a larf arn't you? actually being that it is now over 60 years later then the answer is "all of them" Did you want specific numbers, or just examples?
My home town of Clydebank, near Glasgow was completely obliterated in the Blitz.
I think I read somewhere that only 7 buildings in the whole town lay totally unscathed (although, this may have been inaccurate).
I think Clydebank was either the worst hit, or 2nd worst, just behind Coventry.