Piece of Plywood (Boscombe East BH7)

Hello All. Well the wind last night did for our window in the garden shed so now we are looking for a piece of plywood to patch the hole up until we can sort it our properly. The plywood needs to be at least 76cm by 72cm. If anyone has such an item that they no longer need, we would be very grateful to collect it. Thanks in advance. Sandra Oddy