It's a comforting favourite, but can an egg and cress sandwich ever be worth £6? SARAH RAINEY tries M&S's 'posh' version of one of our staple sarnies

Almost a fifth of Brits say it's their favourite filling. And M&S jumped on the bandwagon this week, with their 'Posh Egg Mayo and Watercress' sandwich - for an eye-watering £6.

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