I dressed all over in M&S thermals to see if it saved putting the

Dianne Bourne put Marks and Spencer's range of thermal wear to the test following advice to "heat the human, not the home"

Marks and Spencer Heatgen review: We dressed heat-to-toe to test

Asda and Primark thermals compared to M&S version - with clear

M&S shoppers snap up £35 'cosy' thermal jeans that are a 'godsend

This super-soft thermal top is the perfect base layer for chillier days. It's made with Heatgen Plus™ to keep you extra warm without weighing you

Heatgen™ Medium Short Sleeve Thermal Top

140 Denier Thermal Sheer Fleece Tights, M&S Collection

Heatgen™ Medium Thermal Long Sleeve Top, M&S Collection

Savvy mum shares genius 'Monday to Wednesday' spending rule to

Equally perfect for layering or lounging, these versatile thermal leggings have your cold-weather comfort covered. Our innovative Heatgen Plus™ fabric

Heatgen™ Medium Thermal Leggings

Heatgen™ Medium Thermal Leggings, M&S Collection

Equally perfect for layering or lounging, these versatile thermal leggings have your cold-weather comfort covered. Our innovative Heatgen Plus™ fabric

Heatgen™ Medium Thermal Leggings

200 Denier Thermal Fleece Lined Tights, M&S Collection