If, after travelling to your destination, the FCDO advice is to leave the area you're staying in, then you're covered to cut your trip short.
If this situation arises, please contact our 24 hour assistance helpline on +44 1243 621 537 (01243 621 537 from the UK).
If the FCDO advice is simply against travelling to the destination you are already in, there is no cover to cut your trip short; however, you can call the 24 hour helpline if you need any help or advice.