I want a small piece (500mm square would be fine) of thin ply (3/4 mm) - preferably birch.
Looked at various search engines, etc. but cannot think where to find any. From a historical perspective, High Wycombe should be groaning with suppliers - but I can't find any that look promising for such a tiny amount. And of course I don't want to use much petrol for such a small quantity.
Am I missing an obvious place to look? I don't think the sheds usually have birch (mostly some anonymous tropical hardwood).