A survey, carried out by the BBC, testing around 140 types of ready-made sandwiches, found that many contained alarming levels of salt in their unlisted ingredients.
40%, of those tested, contained 2gr or more - this being a third of an adults recommended daily allowance. This can be compared to a typical packet of ready-salted crisps which averages 0.5gr per packet.
Some sandwiches tested contained over 3.5gr of salt (equivalant to 7 packets of crisps). The worst offender wa Pret a Manger's 'All Day Breakfast' sandwich - but, in general those containing bacon faired the worst.
The best performers were the Co-Op's 'Healthy Living Tuna & Cucumber' and Tesco's 'Healthy Living Chicken Salad'.
It is estimated that about 40% of strokes (representing 50,000 cases in the UK alone) could be prevented by better salt-intake-management.