Do you live anywhere near an Ikea? they have a wood/coated contiboard recycling bin in the carpark - you can get loads of stuff for free and they always have stacks when it's been sunny coz people stop hording it for their wood burners.
i am about half an hour away from an ikea so i'll check it out free sounds good thanks tizzy. and i think i'll leave the mdf if it gives of gases wasent awear of that thanks blackecho