Thermal Top

I think Robinsons have thermal base layer clothing as well, but I don't know if it's any good as I've not considered buying base layer clothing, but I'll be looking for good thermal breeches, etc, for winter :)
 
Got mine from Matalan, ridiculously cheap compared to Blacks etc. As long as you don't mind it being 'last season' :) merino wool is superb as is silk, both pricey but very thin, soft, warm and long lasting.
Some of the cheaper things don't seem so warm or comfortable and don't wash or last as well.
 
newrider.com