I have lots of 24mm birch ply off-cuts from CNC-ing our staircase, in SE16, will check if I have a 50x50 piece, if so you’re more than welcome to have as much as you want.
That would do the trick and I'm not far from you.
Just double checked my measurements and I actually need a piece that's more like 60x50.
If you have anything left that size let me know, cheers
Anyone got any 25mm thick pdf or ply they don't need?
Looking for a piece about 50cm x 50cm