By the way, this is the place I got my bamboo socks from (for general everyday use not hillwalking) - I see their bamboo base layer is 28% cotton: https://bambooclothing.co.uk/store/show_product/MZ227-BKG (68% Bamboo Viscose, 28% Organic Cotton and 4% Elastane). Although their baselayers do get good reviews: https://bambooclothing.co.uk/category/BAM013
Have never owned a bamboo baselayer but have a bamboo towel and bamboo socks and they both have a significant amount of cotton in the mix. Meco is new to me but as someone who either uses Polyester or Merino baselayers it seems to offer a possible best of both worlds so will be looking into that option to replace my now rather worn icebreaker.
Paul, I am also an amateur photographer and like 'Tall PC' am also a fan of mitts.
I find that a pair of buffalo mitts on top of a pair of thinsulate fingerless gloves work well for me when it's very cold and standing around. The fingerless gloves on their own are not very warm but as long as you only need your fingers for short periods at a time it's very quick to take a mitt on and off (quicker and less hassle than a glove) and your fingers will warm up again very quickly when the mitt is back on.
Have never used wristies (first time I have heard of them) but my £5 fleece neck tube/gaiter (similar idea to a buff?) is invaluable in winter, so I would agree with that suggestion too.
I have a driclime windshirt which is great when active, but as Ben says it's not going to be sufficient on it's own when stationary - I have an ageing Montane Solo jacket as well which is what I would wear when stationary or in very cold weather when walking but not that active (eg going downhill or on flat terrain).
I think the Prism may be a modern/current version of the Solo (not sure as not being keeping up to date with gear lately) but seems to be an insulated jacket which is a (imo better) alternative to a heavy/thick fleece (lighter, more water resistant, but just as warm).
So while the Prism (or similar insulated jacket) may replace a thick fleece, a windshirt like the Dricilime is more a replacement for a thin fleece (microfleece) + windproof shell as basically it is those two items combined into one garment.