We have insurance with Animal Friends - they seem to be good. Did try to get out of paying once saying it was a pre existing condition when it clearly wasnt, but ended up paying in the end and have been finr since. We've had to use them about 6 times for our 3 year old lab so we've found it useful to be insured. Its about £36 a month premium policy which includes access to 24 hour virtual vets called Joii - amazing service!!
Hope that helps!
Hope that helps!