Hi Paul. You will probably get more knowledgeable advice from others but CIS may be worth trying. We have 'free' CIS travel insurance with a Coop Privilege bank account and I think I read that travel to some places requires notification and possibly an extra premium but not that anywhere was actually excluded.
Simon
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Simon Colbeck/Emily Janes
01923 254654
11A Claremont Crescent,
Croxley Green, Rickmansworth
Herts WD3 3QP