David Appleyard's English Language User Guides and References
Index of Americanisms
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AmericanAmerican BritishBritish
underground economy black economy
underpass subway (pedestrian walkway under a road, etc.)
undershirt vest
undershorts short underpants
unemployment benefits The JSA or jobseeker's allowance has replaced the old-fashioned term 'unemployment benefit' to avoid giving the impression that unemployment might be beneficial!  
uneven bars (in women's gymnastics) asymmetric bars
university graduate postgraduate
unlisted (phone) number ex-directory
upscale upmarket
uptown (see also downtown) predominantly residential area toward north of city
utility knife (box cutter) craft knife, Stanley knife