I would check Tesco terms. The £1.50 a month saving could be a false economy. Most insurance companies pay a set amount "per condition", whereas Axa & Petplan pay "per year" - in other words, if a cat developed a long-term illness that needed ongoing treatment, once the pot ran out, you would have to pay for treatment yourself, whereas Axa & Petplan the "pot" is topped up each year.
Lloyds TSB I think do year on years as well I think - I'm sure that's what it says on Kylie's paperwork, only the yearly amount is only £3000 compared to Axa's £7000 - so for a young cat, it
might be worth cross-quoting with AXA - check the small print though.
I changed Kylie over to Lloyds TSB when I didn't know anything about insurance. I started with Petplan when I adopted her in 2002 - she was 2 1/2 then and the premium was about £8 a month (probably as I lived in central(ish) London. They hiked the premium up to about £14 a month in 2003 so I changed providers.
ETA - I just noticed that Tesco price was for 2 cats
I just looked at Tesco and they offer both types so I would check which one they have quoted you (I expect it is the first one) and also the amount of cover they offer.
It doesn't look as if they top the pot up like Axa & Petplan.
From Tesco Website
Annual Policies - These policies usually pay for up to 12 months following diagnosis of an individual condition; ongoing treatment is specifically excluded.
Single pot - Lifelong - These don't have the time limit of annual policies and allow treatment costs to be claimed cumulatively. They're often subject to a single fixed excess at the start of treatment. Often, the policy benefit is high enough to be claimed for the remainder of the pet's life.