We tried Marks and Spencer thermals to help save on heating bills

Dianne wore the M&S Thermal Heatgen long-sleeved top, leggings and thermal socks from the range, priced from £10

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

Marks and Spencer shoppers 'haven't turned the heating on' since buying £12.50 thermal tops - Manchester Evening News

M&S thermals help woman keep heating off for hours in 'impressive' test - Daily Record

Heatgen™ Maximum Thermal Long Sleeve Top

2pk Heatgen™ Thermal Light Leggings, M&S Collection

100 Denier Thermal Heatgen™ Opaque Tights, M&S Collection

16 M&S 'slimming' thermal top shoppers are 'wearing when the heating is off' - Daily Record

11 Ways To Cut Down On Your Heating Bill This Winter

Money Saving Expert Martin Lewis warning over Boxing Day sales that 'aren't as good as they seem' - LancsLive