What kind of “horse insurance” are you after (not a flippant question)?
For vet bills we’ve found NFU brilliant – they’ve paid out without quibble when we’ve needed them and, to be honest, their admin side is ten times better than our vets’.
If you’re just after 3rd party, it would be well worth looking into joining the British Horse Society. Last time Mrs Pz looked their gold membership covered her riding/handling any horse, and anyone riding her horses. Good prices for membership, too.
Even though our two are minimal-maintenance, every-expense-spared, native nags, there’s no way we would ever consider “self insuring”. Might be OK for vets’ fees but I wouldn’t dream of going without 3rd party. Any horse can spook and if a driver swerves to avoid and ends up having an accident I don’t want to be liable for the cost of someone’s lifetime care. I think the guilt would be enough.
We’re currently looking into whether it’s possible to get vet bills cover for our old mare and any-rider 3rd party for the youngster on one policy…