Not sure if this might help, and certainly not this week, but we have annual travel insurance with a Nationwide FLEXPlus bank account for so much (£14?) a month. With them you can exclude complications of prostate cancer to save paying an extra premium to cover it.
I doubt if your Old Man is going to expire with advanced PCa in the next fortnight, otherwise you wouldn’t be travelling on holiday, so my advice, is to wing it, bearing in mind the reciprocal health care agreement with the States of Jersey mentioned above, or keep trawling for an insurance policy at an exorbitant price which wouldn’t cover you for very much anyway once you made a claim!
I was in Jersey fifteen years ago, and woke up with severe gout on a Sunday morning. I was in St Brelade’s Bay, but I found a pharmacy in St Helier miles away that was open. I drove there to get some indomethacin, but unlike in Britain, the Pharmacist couldn’t discretionally prescribe me a few tablets without a prescription.
Of course, all the doctor’s surgeries were closed. I ended up in a wheelchair on and off the BA flight to London, but they were so generous with the red wine it probably made my gout worse!
I take daily allopurinol now and have never had gout since.