cost of sheet ply - and 'DIY quantity' timber?

That is probably their usual price. You may find it a bit cheaper in Wickes, but not by much.

WPB ply is pricy stuff alas.

Timber yard will usually be cheapest. The quality qill almost certainly be better.

I'm paying 15.67 inc vat a sheet for 18mm OSB3 - usually about the same price as the cheapest ply. Your price for 12mm WBP sounds about right.

I asked in Jewsons a few weeks back and they wanted £18 a sheet IIRC.

I bought it in B&Q even though it cost a £1 extra as they cut it to the sizes I wanted for free. (Jewson would have cut it if their saw had been working.)

They had some much better quality stuff with 11 laminate layers but it was about £30 a sheet.

HTH

============================= The current price for 8' x 4' x 12mm WPB exterior grade plywood at my local Wickes is £17.89. Contrary to expectations, I find that Wickes and B&Q (but not Focus) are better on price and quality for sheet materials (Contiboard, plywood etc.) than my local timber merchant.

Cic.

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Try Magnet... you'll be surprised. They are doing a 'loss-leader' on sheet materials and timber, to get the trade into their stores.