Well everyone I have some good news!

today I went to Bookers Timber Ltd in Ellesmere Port, Cheshire and had a chat with them and saw some of their BB grade Baltic Birch plywood and I also spoke to Steve Caddick from their Sales office at their Warrington office.

Steve was VERY helpful and he clarified the Baltic Birch plywood grading system for me.

If you look on their site: Chipboard, Marine Plywood Sheets. Mdf Sheets & Pin Boards - BookerTimber.co.uk you will see that S grade is the highest quality and BB is the next rating down.

Steve explained to me that the ONLY difference between S grade and BB grade was the number of knots/defects/patches in the outside layers of the plywood. The inside structure and the quality of the plywood is not different.

Therefore after talking to Steve we both agreed that the BB grade Baltic Birch plywood his company supply would be suitable for my needs. Of course I will need to get a couple of sheets after I get paid and try them for myself. Once I have done this I will of course post some pictures and the overall results.

Thanks to everyone for the wonderful help you provided