I buy them now & then, usually for hubby - but I can manage 2 or 3 at just under 6g carb for the 3 with cheeses & meats etc on a charcuterie board. I quite like them for giving a bit of texture & crunch and I find them filling.
I used to like the little round seed crackers they did but I don’t think they do those anymore. You can get very similar (I suspect the exact same thing) from Amazon
They are back in M&S!!
I found some today ( apologies to anyone living in Truro as I cleared the shelf of them!) different package but the same seedy crackers inside and still 0.1G carb per cracker.