In comments likely to alarm diplomats, Iranian President Masoud Pezeshkian told Prime Minister Sir Keir Starmer it has a "right" to attack Israel over the assassination of a Hamas leader in Tehran.
UK officials are now considering whether they will need to bring thousands back in the event of hostilities.
Embassy teams have been bolstered to assist with emergency plans and Border Force teams have also been sent to the region as they were during the evacuation of Sudan and Afghanistan.
More than 1,000 military personnel have already been put on standby to possibly get Britons out of Israel and Lebanon, defence sources suggested.
A Government spokesman said: "While we continue to use all diplomatic levers to push for de-escalation, our staff are working around the clock to plan for all scenarios to keep British nationals safe. Our travel advice is constantly updated to reflect the latest guidance." Western leaders have been urging the Iranian regime not to trigger an all-out regional war.
Intelligence experts have become increasingly concerned that Iran is ramping up preparations for a possible attack following the death of Hamas's political leader Ismail Haniyeh in Tehran.
Denne historien er fra August 14, 2024-utgaven av Daily Express.
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Denne historien er fra August 14, 2024-utgaven av Daily Express.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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'I want the chance to prove myself again'
PEP GUARDIOLA feels the need to prove himself all over again-despite his glittering successes at Manchester City.
SEAN HAILS BRAVE CALL
SEAN DYCHE says Everton made a \"brave decision\" to reject Manchester United's £50million offer for Jarrad Branthwaite.
Howe looks to end Toon striking issue
EDDIE HOWE is banking on the competition between Alexander Isak and fit-again Callum Wilson to spark a faltering attack.
Iraola won't play it by the book
ANDONI IRAOLA admits Bournemouth will miss Antoine Semenyo but is happy to accept yellow cards as the price for the club's style of play.
McKenna refuses to rest on laurels and asks for more
KIERAN MCKENNA has warned Ipswich they must build on their improving Premier League form.
Davies sends Blades to top of pack
TOM DAVIES came off the bench to score a late winner as Sheffield United went top.
STAYING AT RED BULL IS TARGET FOR MAX LEGACY
Champion insists he does not need to win elsewhere
How Pope managed to get out of a Stew
OLLIE POPE revealed a heart-to-heart with his mentor Alec Stewart helped pave the way for his timely return to form against New Zealand.
Former intern fights boss for half his £1m company
AN antiques dealer to the stars is locked in a bitter court fight with a former intern who says she has a right to half of his £1million firm.
Highgrrrove's not too ruff for us...
MISSY the English cocker spaniel looks excited to be meeting a King Charles, but Percy the white bichon cross appears to have realised her mistake...