http://www.homebase.co.uk/webapp/wcs/stores/servlet/ProductDisplay?langId=110&storeId=10151&partNumber=100730
These... end of search!
I had the same problem with our kitchen. We have 8 GU10's and I'd tried all kinds of replacements, but they were either too dim or gave a harsh white light. The homebase ones are great, they give a warm light and are really bright. Had 8 now for well over a year and had no problems from them.
Only downside is they are non dimmable... but might not be an issue if you don't have dimmers.