In case anyone hadn't noticed; Robert Dyas stores currently offer Philips low-energy lamps at 69p or THREE for £1, 11 to 18w, ES or BC fittings. I think that they're slightly old stock - the most recent ones have been a little smaller - but the same energy efficiency as the current ones. At that price you can't really go far wrong anyway. Just got a largeish number for work.
No idea how long the offer is on, I can't seem to access their web site.
Later - the web site has the 69p offer but not 3 for a quid, presumably it's in-store only. Doesn't say how long the offer is on for.
Forgot to say that they're 8 year life lamps, not the 12 year.