Sometimes you get cheap gore-tex jackets in TK max that are pretty decent, but you have to go in regularly over a long period of time to find a sweet deal. Otherwise I'd agree that the Swedish M90 jackets are ok, there about £30 - £40. You cant beet a good heavy wool jumper under any jacket though and a decent hat helps prevent heat loss aswel, especially if you're sitting around camp at night, not moving around. Iv had countless times in which I'v regretted not having a decent hat in the past.
I got a sweet German army Gore-Tex, mint condition, in the same bag from the manufacturers - for £50 quid at a local surplus store in Brighton down here. I figured they chucked out all the green uniform when Flecktarn made an appearance in the early 90s.