Pet Insurance advice

[Voldemort]

I'm getting a couple of young female cats (7 months).

I'd like to get them insured and would like some recommendations please. Is it beneficial to pick a company and stay with it as the cats age or, like car insurance, do you shop around at renewal time?

I've had a look at some comparison sites and the price looks like being around £50-£100. Should I buy solely on price or are some companies worth the extra?

Thanks.