B-1 Lancer, which can carry 24 cruise missiles, arrived at RAF Fairford in Gloucestershire on Friday evening

Middle East crisis – live updates

A US bomber has landed at an RAF base in Britain after Washington warned that strikes on Iran would “surge dramatically”.

The 146ft B-1 Lancer, which is capable of carrying 24 cruise missiles, arrived at RAF Fairford in Gloucestershire on Friday evening after Keir Starmer had granted permission for “defensive” US action against Iranian missile sites from UK bases.

The armed forces chief, Richard Knighton, said he expected the US to launch missions from the Gloucestershire base “within the next few days”. The prime minister agreed on Sunday to allow the US to strike Iran defensively from Fairford and Diego Garcia, the largest of the Chagos islands in the Indian Ocean.