The beer in the Old Blue Last near Old Street in London is some of the worst I've ever had. And by my lights if your beer is shocking, you're a shocking boozer, however 'iconic' you are.
EDIT:
Here's shite as well:
The Old Queen's Head, Islington. Full of wankers, beer selection shocking and identikit trendy.
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Stop associating yourselves with astronauts.
Foster's Lodge / Corner House - Annfield Plain (very strange characters got in there - poor selection of beer)
Crown and Thistle / Bob Bells - Catchgate (see above)
The Fighting Cock - Durham (rough as hell, Fight Club on a bad night, only one still open and one redeeming feature is that it served a decent pint of Kilkennys)
Coach and Eight - Durham (always broken glass, seemed to be a sport of rolling glasses across floor to see who stepped on them, crap beer)