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Not sure about the 4x2, it's of such variable quality that there's a chance it may actually be too shit.
But hardwood isn't necessary; if you were to ask a joiner/good timber yard for an offcut of "sawn joinery" that would definitely suffice. I mean you only need 600mm of 20x30, that's firewood to most places.
Or ask a timber supplier for a 600mm sample of ex-25mm tgv (tongue and groove)
Cheers both.
Next question is where do I go to get the wood from.
These old properly heavy dense pine so am I better off just buying hardwood from a building merchant, rather than trying to find good quality pine?
Eg
https://www.selcobw.com/par-hardwood-50-x-25mm-2-x-1
PAR Hardwood 50 x 25mm (2" x 1")
Item Code: 050490001
I still have some offcuts of C24 grade 2x4 which I could also use. If that is viable it'd be great as it would save fucking around finding stock.