I bought a load of CFLs from CPC a few months ago to replace all the Halogen bulbs in my house.
I got some "instant on" CFLs that are actually quite small in physical size that work very well and they're nearly fully bright from the start. I also got some candle shaped ones for my side lights and bedside lamps, these are dim as fuck from switch on, but do warm up fairly quick, but maybe it's less of an issue because there's 4 of them on the wall.
My local ASDA have recently had some reasonable multi-deals on the end of an aisle for CFLs.
These are the "quick start" bulbs -
http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=LP07406 (but no longer stocked!!)
These are the slow starting ones -
http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=LP07271
I did buy a selection of LED GU10s from DX.com a while back and found probably one or two bulbs that I liked. Could do with replacing all the kitchen and bathroom halogen GU10s with LED bulbs.
EDITED: 20 Nov 2014 16:17 by ANT_THOMAS