UK armed forces being trained to cover possible Border Force summer strikes

The PCS union held four days of strike action at Heathrow in April over the imposition of a new rota. Photograph: Jamel Smith/PA

Members of the armed forces are being trained once again to cover for striking Border Force staff at ports and airports, the Guardian has learned.

Dozens of uniformed soldiers have been seen at Home Office facilities in south-east England amid concerns that the UK could be about to enter another summer of travel chaos.