brits advised to stay away from the islands

[Dedworth]

If the brit government advises against travel to certain countries does it automatically negate your travel insurance to said country?

Looks like our policy wouldn't cover if travelling to that specific area :-

We will not pay for claims arising directly or indirectly from:

Your travel to a country or specific area or event to which the Travel Advice Unit
of the Foreign & Commonwealth Office or the World Health Organisation (WHO) or
similar body has advised against all or all but essential travel.