Ouf, you don't need to tell me about cat food - and I've only got two cats who eat a mix of wet & dry.
A standard box of 12 pouches in Tesco has gone up from £3.75 to £5, and there's not been a sniff of a multi-buy offer in a very long time. You used to be able to buy 3 for £10 or 3 for 2 and stuff... I've seen the boxes of 12 for as much as £5.50 in places (yes, that's you, Zooplus).
Iceland still had the boxes of 40 (mixed selection so beef, chicken, salmon, tuna) at £13.99 the other day, but it's £15 in Tesco last I looked.
The girls' Royal Canin "Sensible 33" biscuits have gone up more than £10 a sack in the last year and a bit. I think I paid about £56 for a 10kg sack recently. They've also stopped doing the "2kg extra free" offers on that, too. (yes, that's you again, Zooplus...)