Baggage handlers and check-in staff at Gatwick and Stansted airports are to strike on Bank Holiday Monday in a row over pay, unions say.

At Gatwick, 318 Swissport workers will walk out for 24 hours, halting services at some airlines. A second strike is planned for Friday 29 August.

The staff have rejected a 3% pay offer which the Unite union said was "an insult" and well below inflation.