In reply to Lupine Lacuna: I just used some vouchers to get the Decathlon Quechua Bionnassay £40 soft shells, after various recommendations on here. Used them in scotland last week with and without a thin base layer underneath and they were ace. Good vents in the side for warmer times too. Definitely a good purchase!
Prior to that, and still for colder days, I've got Paramo Aspira trousers which are great for walking, but less movement for climbing. They're still brilliant and I also use them for boarding, but I think from what you've said they'd be too warm for you.
I'd love to justify a nice expensive pair of mountaineering pants but to be honest, with these two pairs on the go, I can't!
C-: