Thanks Topknot, sorry for the delay in acknowledging. These are cheap copies rather than the genuine BDUs but I got a couple of pairs anyway to try them out (from Surplus & Outdoors in the end, 2 pairs for £25). The polycotton is more poly than cotton but the general quality seems good, with generally good quality seams (ho ho). Walked 12Km in them yesteday and found them very comfortable if a little warm (probaby because of the polyester). Durability can only be tested over time of course, but I reckon they're a reasonable buy.