Probably pitch pine, but any pine you get machined now will be much paler and more yellow. Douglas fir or Siberian larch would be a good match if you can find it. Champion may have it too.
https://www.slhardwoods.co.uk/products/solid-timber/planed-all-round-par-25mm-thick/douglas-fir-planed-all-round-board-25mm-thick
https://www.woodshopdirect.co.uk/planed-all-round/douglas-fir-timber/
Even if sizes are not listed give them a phone and they'll probably cut to size.
Some excellent advice here! Thanks so much, I love this forum.
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Probably pitch pine, but any pine you get machined now will be much paler and more yellow. Douglas fir or Siberian larch would be a good match if you can find it. Champion may have it too.
https://www.slhardwoods.co.uk/products/solid-timber/planed-all-round-par-25mm-thick/douglas-fir-planed-all-round-board-25mm-thick
https://www.woodshopdirect.co.uk/planed-all-round/douglas-fir-timber/
Even if sizes are not listed give them a phone and they'll probably cut to size.