I'm looking for a small(ish) piece of plywood a minimum of 35cm wide by 45cm long, preferably around 8mm thick (but thickness is negotiable)
I'd be happy with anything around 5mm thick but twice the size (e.g. 70 x 45 or 90 x 35) so I can cut it in two to give me a 10mm thickness.
It doesn't matter if it has been painted previously I can always paint it again to match its new surrounds.
It doesn't need to be exterior ply as I'm using it indoors but I'm not excluding exterior if it is all I can find available
Fingers crossed

Plywood (CT12)