Another Axa user here.
One thing I've noticed you have to be careful of (sorry if everyone already knows this but I've not been a cat owner for some years so it's all changed since I last got a quote!) - often the cover will exclude not only the agreed excess but a percentage of the total cost too. Perhaps this is just for older cats, I don't know. I very nearly went with Petplan, whom I used to use and really liked, noticed just in time that they want a wacking great percentage of the total cost of the treatment. Given that their premiums aren't cheap, this is potentially very pricey!