In reply to Rob Greenwood - UKClimbing:
I have a Marmot driclime somewhere which I used for years for mountain rock. I think mine is a women's XL which is why I found it on the Needlesport sale rail for about 25 quid in I think 2000. I wasn't a perfect fit, but I can't imagine it fitted many women very well as it feel like a bloke's medium, with just slightly shorter sleeves that you would expect!
Years later I found a North Face version of the driclime which was slightly more refined - still use that occasionally. And then 5 years ago I reviewed Wild Country's go at the same kind of jacket - they Dynamic jacket https://www.ukclimbing.com/gear/clothing/casual/wild_country_clothing_range... That's still often the jacket I grab for cragging, and is a really nice, simple and effective coat.
So I agree, shelled microfleeces are really great for UK conditions but having said that, having been a Buffalo user in the Highlands for quite some years, I don't think I would recommend even a hooded driclime for use without waterproofs. I never really liked the feel of getting soaked in my Buffalo shirt, better for winter, but I think you could end up quite cold and miserable in driclime or similar out hillwalking on a munro if it rained hard - so for Andy S's original question, a driclime or similar is really good, but I'd take a light waterproof as well.