Latest: Four dead after plane collides with helicopter in mid-air

Latest: Four people have died following a mid-air collision between a helicopter and a two-seater plane in Buckinghamshire, Thames Valley Police Superintendent Rebecca Mears has said.

Update 7.41pm: Four people have died following a mid-air collision between a helicopter and a two-seater plane in Buckinghamshire, Thames Valley Police Superintendent Rebecca Mears has said.

Superintendent Mears said the aircraft were carrying two people each.