The M@glite LED comes to mind.
http://www.maglite-torches.co.uk/maglite-led-21-c.asp
With C and D cells i always think off M@glite's somehow.
I'm not sure what choices you have in the UK. I've heard Maglites are expensive there.
If you have a Maglite, check this thread.
What price range are you looking at?
The only problem is that I don't think they have a Lowe's in the UK.Task Force 2C, from Lowe's:
http://www.lowes.com/lowes/lkn?action=productDetail&productId=225285-50584-FT-NS-2C 3W&lpage=none