Pièce of mountboard (Ponsanooth TR3)

Hi freeglers

Does anyone have a spare piece of mount board, size 70cm X 70cm or slightly larger?

Any colour would be fine. I need it to make a concertina blind for the ceiling window in the dining room, as shielding out the sun reduces the temperature a bit.

I'm able to collect fro Truro and Falmouth areas, and all places in between.

Many thanks for looking

Helen