Well guys...I just had a look a the Lidl leaflet thing that comes with the papers and here in Ireland Lidl are selling 3x2 OD green plastic tarps...not sure if they're selling them in the U.K. though
Sorry guys
http://www.lidl.ie/ie/home.nsf/pages/c.o.20100422.p.All-Purpose_Tarpaulin
Sorry guys
http://www.lidl.ie/ie/home.nsf/pages/c.o.20100422.p.All-Purpose_Tarpaulin