Marks & Spencer has been criticised for selling a “posh” egg mayonnaise and watercress sandwich for £6. A standard egg and watercress sandwich from the retailer costs just £2.65 - making the “posh” version more than twice the price. Jane Hawkes, a consumer expert said she would “love to know” what was in the sandwich to make it so “posh”. Ms Hawkes added: “Pushing up prices to cover costs is one thing, but taking the proverbial is another. “Cost-conscious customers could well decide they are happy with their favourite budget lunchbox filling – at a quarter of the price.” A description of the sandwich says it contains a whole sliced egg with mayonnaise and salad cream, alongside watercress and pepper in nine-grain bread. The “posh” version contains 166g of filling according to M&S, compared to 115g in its standard offering. The shop launched the deep-filled range earlier this year as part of its 2024 café menu. A £5.50 prawn and mayo sandwich and a £6 smoked salmon and cream cheese sandwich are also included in the range, alongside a gluten-free cheddar sandwich, which costs £5.25. For vegans, the avocado and “Rainbow Veg” sandwich, which also retails for £6, contains layers...