My husband Tony has advanced Pca with bone metastases, and has been finding it difficult to get travel insurance. He has contacted many specialist companies, who mostly refused to insure him, or wanted a vast premium, or imposed tricky restrictions. He found the whole process of these phone calls distressing, as he had to go over and over the details of his condition and treatment, only to be rejected as uninsurable at the end of a long conversation (this even happened with Saga, whom we were trying to book the holiday with).
But, like several others on this forum, we decided to try the Nationwide Flexplus Account, which includes travel insurance (and several other insurances). Their screening questions were mercifully brief, and then they said they'd have to charge him an extra £96 a year. The account itself costs £10 a month, and there is no requirement to switch from your existing current account or pay in a minimum amount each month.
So we opened an account, and now have worldwide annual cover for both of us, at a total cost of £216, somewhat offset by the 3% interest they pay on balances of up to £2,500. We have to inform them of any changes in our health, and cover for a booked trip may be withdrawn if there's a deterioration, but cancellation will still be covered.
We are so relieved and grateful to have found this. Tony is on hormone treatment (decapeptyl) but feels very well in himself at the moment; it won't last forever, but it means such a lot to us to be able to plan a few more special holidays while we can.
This, or other bank-linked insurance, is certainly worth a try if you're having difficulty getting insured.