Got a few places for u mark, i hope they help u out, i can vouch for silvermans ,' penrith survival ,and field and trek as i have bought kit from them in the past
http://www.surplusandadventure.com
http://www.fieldandtrek.com/ft1/
http://www.military.co.uk/
http://www.adventurekit.com/

hope u find what u after