I take it you have pedigree Persians?
I do have a pedigree Persian who is now 9 and she did come with the standard month's free insurance from Petplan.
I then changed insurance companies for her and I have never needed to claim anything for her as she is mainly an indoor cat.
The one time she needed to visit the vet to get eye drops the cost was £63 so it wasn't worth claiming to save £3. This was a few years ago.
I do also help an older lady who lives next door care for her dog which is insured with Petplan and I have found the service to be truly amazing.
The dog had a suspected mast cell tumour and it needed to be removed. Whilst the tumour was being removed the vet found another suspected tumour and took a sample of it.
Five days later that tumour had to be removed as well. Also both tumours had to be sent away for testing.
Anyway as the dog's owner is unwell herself I got the job of dealing with Petplan as by the middle of the treatment the bill was already up to £1900.
I got the claim form from the vet and filled it in best I could thinking that the owner would have to pay out the money and then get reimbursed.
However the vet just took the excess of £115 and the claim form and continued to add further things to the bill.
Anyway the bill now stands at £2500 and Petplan have paid it in full (except the excess) no quibble, no question and if there is any further cost because of this specific condition this insurance year then it will be added as part of the same claim.
I know that this isn't exactly what you asked but I hope that it is helpful.
Just out of interest, have you got the "12 months essential" or the "covered for life" policy??