I cant seem to find any light coloured base layers with long sleaves and a zip neck.

Does anyone have any ideas who makes them, and where I might be able to get one from?

Why the need for light colours Daniel????

Patagonia used to make white capilene base layers - not sure if they still do but they certainly have light grey www.patagonia.com - great for glaciers in the heat of the day when darker colours tend to absorb more heat. Capilene wicks very nicely as well.

That's interesting Jon, I did not think that darker coloured base layers would make much difference to heat absorption, since I thought that only outer layers "reflected" the heat back and that if so, then the heat dissipated and would not penetrate through subsequent layers???

They won't make any difference when worn under other layers, but when it's really warm - and glaciers at altitude get very, very warm - and you're just wearing, say, a baselayer top and trousers, the colour does make a difference.

Arghhh right, having only ever visited glaciers in Iceland, I didn't know that!!

(That's the food chain by the way, not the country!!!!)

Patagucci do indeed do a light coloured base layer, saw one in Outside in Hathersage today.
I was tempted to buy it but didn't know much about the Capilene fabric, until Jon's post above.

One advantage I find of lighter coloured base layers is that they seem less likely to attract those damn Scottish midges.

Capilene works really well. It was pretty much the benchmark baselayer until Dryflo and Powerdry appeared and is as good or better than either for wicking in my experience. The only disadvantage is that the fabric uses a treatment rather than the physical structure of the fabric, so wicking performance deterorates, albeit very gradually, with sustained use and washing.

The Berghaus x-Static top is light grey...

Rohan do a range of white long and short sleeve base layers. OK, so not super technical but very good all the same (my Mr. swears by them).

Regatta do a cheap & cheerful in a sort of light beige colour. Works ok and washes well.