I'd echo Eddie's comments about Sundridge, I've got an Igloo jacket which is absolutely top notch, the zip-out inner is more like a fully-sleeved puffa jacket and I reckon a lot warmer than most fleeces. Mine also came with a free sleepskin hoody which is designed to be a base layer, with all three layers on (hoody, zip-out and over jacket) you're warm as toast all day, lovely in the winter.