Just, out of curiosity, browsed the Primera website, and come across this page regarding fees and charges
https://primeraair.com/travel-info/fees/
Can they really be serious? £ 7.00 transaction fee 9well I suppose it's a transaction fee not per seat), £ 60.00 for a "Premium Beef Meal" (£30 for a "standard" beef meal) - crickey, I can spend £ 60.00 per person and get a really good 3 course meal in a half decent restaurant in Nottingham.
Their fares may be low, their add-ons are "Ryanairesque"!
You need to scroll down the page towards the bottom as the first tranche of fees are European services.