Very carb (and lower salt) tomato ketchup (hurry up Heinz)
Some sort of crispbread/cracker to put marmite on for a snack
M & S ready meals and prepared "cook yourself type" that are low carb (they do a big range of low fat meals) but so many of their prepared products such as sandwich fillings, gucamole, dips are full of maize starch which make them unsuitable for low carbers.