I’d use wisa ply for the internal walls. Grain can look great if you’re lucky, or fine if you’re not.
http://m.builderdepot.co.uk/18mm-x-1220mm-x-2440mm-softwood-c-c-wbp-plywood.html
Ta. It's annoying they don't deliver to my area, their prices seem to be so much cheaper than everyone else.
@Hovis started
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I’d use wisa ply for the internal walls. Grain can look great if you’re lucky, or fine if you’re not.
http://m.builderdepot.co.uk/18mm-x-1220mm-x-2440mm-softwood-c-c-wbp-plywood.html