£7.10 for one £12.78 for a pair.
I believe I have two sets of the following, one as sidelights and one as number plate lights. They've both been in for around 18 months and are still going strong. The first set of cheap ebay jobbies I got lasted about two weeks before flickering, so it's worth the added expense IMO.
http://www.autobulbsdirect.co.uk/50...degree-white-blue-red.html?bulb_search=c29683