I tried Marks and Spencer's £16 thermals and instantly realised I

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

Heatgen Plus™ Thermal Brushed Leggings

Brushed Pencil Pleat Blackout Thermal Curtains, M&S Collection

Thermal Ankle Length Leggings

Consultation questionnaire - all responses (PDF - Haringey Council

Marks & Spencer thermals - M&S seeing huge uplift in sales of these winter thermals

Thermals, Lingerie

Marks & Spencer thermals - M&S seeing huge uplift in sales of these winter thermals

I dressed head to toe in Marks and Spencer thermals to see if they really DO help keep the heating off - Manchester Evening News