Looking for fine plywood

Thanks for your suggestions lads.
Boxes will be about 14" square and upwards, so me making my own ply is a bit ambitious.
I’ll speak to Latham as long as they are not expecting an order for 10 sheets of 8x4 at £ 50 a go.
If Axminster follow the forum I hope they do talk to other businesses, it’s in all their best interests.
If there are any other suppliers, let me know.
I’ve just seen that the Harrogate show is cancelled!