Situation in Iran:
British Nationals who are in Iran can access up to date guidance from The Foreign, Commonwealth and Development Office (FCDO) here: https://www.gov.uk/foreign-travel-advice/iran
FCDO have also asked British nationals to register their presence in Bahrain, Israel, Kuwait, Palestine, Qatar and UAE [Links below]
Bahrain:
https://www.register.service.csd.fcdo.gov.uk/.../tell-the...
UAE:
https://www.register.service.csd.fcdo.gov.uk/.../tell-the...
Qatar:
https://www.register.service.csd.fcdo.gov.uk/.../tell-the...
Israel:
https://www.register.service.csd.fcdo.gov.uk/.../tell-the...
Palestine:
https://www.register.service.csd.fcdo.gov.uk/.../tell-the...