Be careful. I almost jumped ship to another insurer about 18 months ago but inertia, disorganisation and laziness led to an autorenewal and thank God it did, because about a month later Iggy almost died from a hitherto undiagnosed congenital liver problem that needed major surgery to correct, which any new insurer would probably have deemed a pre-existing condition, leaving me with a £12k vet’s bill.
Make sure they cover any ongoing illness AFTER renewal, as a lot of insurers will pay out, right up until the renewal date, then shut the claim down. You want an insurer that will pay out for the duration of any illness, NOT just until the policy renews, as you can be left with some huge bills if one of them gets a long term illness.