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

#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

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I tested the popular M&S thermals and didn't need to turn on heating for hours' - Mirror Online

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I tested the popular M&S thermals and didn't need to turn on heating for hours' - Mirror Online

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Heatgen™ Medium Thermal Long Johns, M&S Collection

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