CASH surveyed 603 barbecue food products such as burgers, sausages, crisps, salads and dips from the 7 leading supermarkets and the leading brands. The research highlighted just how much salt is unknowingly being eaten when you have a barbecue. http://www.actiononsalt.org.uk/media/press_releases/bbq_2010/bbq_survey_2010.html
I agree, home-made is best every time, be-it burgers, dips or coleslaw, at least you know what goes in it and can leave out or control the level of salt. I prefer to leave it out and use ground pepper, garlic and natural spices for flavouring, but admit I do like my local butchers sausage range!
Its the same as supermarket ready meals, full of salt and artificial colourings, far better to make your own meals with fresh ingredient's, although I know for some this is impossible.