Matty F wrote:
On Sep 25, 8:33 pm, Andy Dingley wrote:

Douglas Fir might be your best all-round choice. Good structurally,
light & strong, pretty good rot resistance. Easier to buy from non-
specialist yards too.

Can't you get timber in the UK that is treated against rot?
In NZ we would use H3 treated pinus radiata, as Douglas Fir won't
absorb
the treatment well, and only lasts a few years outdoor if untreated.

Pinus radiata wouldn't last five minutes here. Nice to live in a climate
where it does :-)
I would ignore the advice and go for recycled oak beams. Pitch pine is
also reasonably easy to source, and should be a good alternative. Doug
Fir I wouldn't be so sure of.