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https://www.edecks.co.uk/products/5727/128/471/0/green---treated-shiplap/cladding-(12mm-x-120mm)
Cheers. Looks like they'll deliver to me.
Do you have access to a router table or table saw? Get the taller Wickes board and trim down and re-profile the cut bottom edge?
As it's the bottom back that needs replacing I can work with something close enough and trim the excess. Although I had wanted to replace two other bits by the door at the same time, but they aren't absolutely necessary.
Don't have either a table saw or router. I want to get a router, but funds are a bit tight. I do have a circular saw, but I need to learn how to use it.
https://www.withamtimber.co.uk/cladding-and-framing/cladding/shiplap.html
https://www.edecks.co.uk/products/5727/128/471/0/green---treated-shiplap/cladding-(12mm-x-120mm)