For your purposes, get the base iPad. There’s no point having an expensive device in the kitchen where it’s more likely to be damaged, and where the better screen of the Air isn’t going to be noticed as you’ll be concentrating on tasks more than the viewing experience.
The iPad 11 is still being sold at the price point the iPad 10 was reduced to - making it a very good deal unlike the iPad 10 that while it was inevitable the new form factor would come with a price increase, was still £100 overpriced at launch and presumably similar in other countries. Against that good deal, the Air isn’t as easy an upsell as it was a few years ago - because anyone would rather get a good deal on something that’s more than they need than take an overpriced lower model.
AppleCare+ used to be the same on the iPad and the iPad Air, but that is no longer the case - it’s £10 cheaper on the base model for 2 years, and 50p a month cheaper if going for monthly. If you’re not getting AppleCare+, the base model would be cheaper for an out of warranty repair if one is needed.