I think it may be £8 per month at the bank.
Some banks have accounts with monthly fees which give you holiday insurance as part of the deal.
Lordalex and I are just opening one right now as it is much cheaper for us to get insurance this way as we are both too old now for our previous policy which was , like sherradk's, included with our house insurance.
Look at the bank's website and it will give you details of the policy. The one we are going with looks just as good, if not better than our previous one.