I quite like the Marmite ones (in moderation) but Cheese & Onion will always go well with a pint! Still can't do more than one pack of Prawn Cocktail crisps a year! Did try the Worcestershire ones a little while ago - not bad. Still haven't tried the Pickled Onion flavour yet, working up to it!
I haven't actually tried any yet. There used to be fish and chips crisps when I was at school. Tasted nothing like fish or chips but very nice. I liked the turkey and stuffing ones at christmas very tasty.
The Squirrel ones follow on from the publicity around grey squirrels outcompeting our native red squirrels. They carry a disease which the greys happily live with but kills the reds. Lots of restauranters are now coming up with grey squirrel recipes as a novel way of highlighting the cause. I'm not suggesting Walkers have been out rounding them up though!
I'll do some more research on this and report back - purely in the interest of my overseas friends who need to know this kind of information ;-).