I tested the popular M&S thermals and didn't need to turn on heating

#xa; Keen to find out if she could save on her heating by investing in Marks and Spencer thermals, reporter Dianne Bourne put the layers to the test - and she was amazed by the result

I turned off the heating for a week to only use cheap gadgets like hand warmers - two stood out and will save you cash

Heatgen Thermals, Lingerie

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2pk Heatgen™ Light Thermal Long Sleeve Top, M&S Collection

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