Performance Thermal Underwear, Thermal Baselayers, Thermal Midlayers, Fleece and Waterproof Jackets.
Sub Zero Technology Ltd. manufacture thermal underwear, thermal baselayers, thermal midlayers, merino wool base layers, childrens thermal underwear, softshells, balaclavas, hats, windproof hats, gloves, socks, walking socks, ski socks, tube ski socks, fleece and waterproof Jackets in England at their Leicester factory. Not everything they sell is made in England, but mostly they do label which items are UK made on their website so you can easily find their UK made stuff. Their own brand items are usually UK made. If it does not say made in the UK then it is probably made abroad. They say on their twitter “Pioneer in outdoor clothing, Design Council ‘Millennium Product’ & multiple award-winner. Proud to say our products are Made in England”. Available at the Sub Zero online store – http://www.subzerostore.co.uk
It is hard to find a UK made fleece jackets these days (companies like Berghaus and Karrimor now make all their products abroad; they used to manufacture in the UK). Sub Zero still make their fleece jackets in the UK. There is a review of a jacket here. Some other companies make fleeces in the UK are:
ukmade - UK Made Products - BRITISH MADE 