In reply to 2PointO: FWIW my current thinking on cams for general UK climbing is:
small - Wild Country Zeros, sizes 4,5,6
medium - DMM Dragons, sizes 1,2,3,4
large - DMM Demon cams, sizes 3.5 & 4
I think Dragons are currently the best cams on the market in the size range 1-4.
Above that Demons, retain most of their advantages but are a bit lighter.
However, below a Dragon size 1, I think you should really look at dedicated micro cams. My preference is for WC Zeros as they retain the doubled slings of the Dragons/Demons, but others prefer Metolius Master cams, Aliens (now being made by Fixe) or Black Diamond C3s.
HTH