Many of the UK ’s most popular shop-bought sandwiches contain "alarmingly high" levels of salt, with one particular offering found to have more sodium than almost five McDonald’s cheeseburgers , a new study has revealed.

Action on Salt & Sugar, a leading health campaign group, analysed 546 sandwiches, wraps, rolls, and baguettes sold across supermarkets and high street chains. Their findings indicate that one in 10 of these lunch options exceed both salt and calorie health targets.

Almost half (44 per cent) would carry a red or "high" salt warning on their front-of-pack labelling, while nearly a third (32 per cent) deliver half or more of an adult’s maximum daily salt limit in a single serving.…