What religion are you alluding to, Bazile?
There are no meat products in meat flavoured crisps, but Muslims and Jews would have no problem eating beef; Sikhs will eat pork as will Hindus are not vegetarian.
Marmite ones have been in the shop recently. I bought a bag just a few weeks ago. Despite my earlier post, it's a shame the hedgehog ones seem no longer sold. I liked the novelty even if I had no idea if the taste was even close.
I think they had a problem with separating the bristles og. some got through and what with the blood and all that it spoilt the taste of the hedgehog crisps.