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Its £45 a sheet at Builders Depot at the Moment. I've had about 20 sheets off them recently in 12mm and 18mm. The first batch of 12mm had loads of patches but the rest have been pretty decent. Most of the 18mm i've had has had one or two patches at most. Best to go and choose your own sheets though as its pot luck with delivery.
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I've had 2 of the 18mm sheets over the past 3 months form builders depot. Both had different shaped patches and also looked from different sources but were pretty decent overall (especially for the price compared to elsewhere). They'll do cuts on the panel saw for 90p each too (on weekdays), to fit them in the car.
Christ, plywood is expensive at the moment. I paid £35 a sheet for BB grade Birch Ply when I bought 6 sheets in April 2019. It's now £80 a sheet.
Having to re-think some upcoming projects...!