One treat for four cats, all ages

Four cats ranging from a kitten to a senior — that's a genuinely tricky treat-buying situation, and I can see why you want to simplify it. Cats are notoriously fussy, and they tend to go for strongly-scented, meat-based treats while rejecting anything sweet or grain-heavy. The best options are high-protein and low in unnecessary additives. Before I suggest something that works across all four, are any of them on a restricted diet — kidney issues, food allergies, weight management? And is this mainly for rewarding, or are you also using treats for things like pill-hiding or getting the shy ones to come to you?

That's really helpful — and good news on the senior girl. Given that she had a kidney flag in the past, it's worth keeping phosphorus in mind even if she's cleared, so I'd steer away from anything unusually high in fish or organ-heavy formulas. What's the age spread of your cats?

A fussy senior is actually your hardest variable to solve for, so I'd recommend Dreamies Mix Treats — the chicken and cheese variety. They're small, intensely aromatic (which is what draws in fussy cats), and they have a crunchy shell with a soft centre that most cats find hard to resist regardless of age. They're not heavily fish-based, which is better for your older girl. The protein content is decent, they're low in sugar, and crucially they come in large resealable pouches that are genuinely economical for a four-cat home. You can buy a bulk pack on Amazon UK — six 200g pouches — which means you're not constantly reordering. The 1-year-old and 3-year-old will go through them fast, but the portion guidance keeps it sensible. One bag, four happy (or four tolerably-interested) cats.

Completely understandable, but yes — Dreamies are fine for cats from 12 weeks upward, so your 1-year-old is well past that threshold. The main thing to watch with a young cat is quantity rather than ingredients; treats should stay under 10% of daily calories. For the senior, the same rule applies, and since she's been cleared by the vet, you don't need a specialist senior treat formula. The simplicity here is the point: one product that doesn't require you to manage multiple bags or remember who gets what.