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Grandis is the red hardwood that is used by joiners for stable knot free wood. The pine from B&Q is not that bad for softwood (pine), generally it's being stored at around room temperature as well. There's no silver bullet, you have to drive around and places and be prepared to leave it if it doesn't check out. Look carefully at every piece you buy and be prepared to stand your ground. Places don't like you cherry picking but it's not worth letting them sell you rubbish.
You can go to a joiner but it will be expensive.
I need to trim out some newly fitted windows with something slightly more thick than just architrave, because they've been fitted flush to the inner wall and there would be light leakage round the sides of blinds when fitted otherwise.
I was thinking 38mm thickness should do it. What kind of timber should I go for - I thought that bog standard pine from BnQ etc might be a bit too shitty - and any recommendations for where to buy it..?