I bought the Millet pants in the end and have worn them a few times out already. Definately to warm for the walk in unless its particularly foul!
I just wear those Powerstrech trousers that were linked going cheap on the walk in and the full length zips make it really easy to just pull them on in a minute. If it was really stormy I might like a mid layer on my legs but that might be interesting in the walk in. I will report back when that situation happens but at the moment they are good. Comfy and look smart. The big thing that I like is the high waist. The decathlon soft shells always got in the way of my harness and my tops used to pull out when I tucked them in. They were just too short for me in the largest size to be honest.