Urgently required 10mm to 12 mm thick Plywood Sheeting. (Southport PR8)

Need a piece of plywood sheeting URGENTLY....at least 10mm thick and a minimum of 36 inches wide by 74 inches long,to put onto a single bed top,as the thin wood on the top has collapsed,and obviously the sheet has to be clean and dry if possible,can pick up from anywhere in the local area of Southport,up to a max of 10 mile radius...Contact me anytime on 07909666700....Thanks for reading.