A row over security at Stansted Airport has broken out after it was alleged an aircraft was flagged down "like a London taxi" as it moved towards the runway for takeoff.

The GMB union says a Ryanair plane was stopped by one of the airline's employees, breaching safety and security rules.

Ryanair has confirmed the incident took place, but says safety was not compromised.

A co-pilot has been disciplined by the airline.

'Unorthodox' action

A GMB spokesman said the plane, with approximately 100 passengers on board, was flagged down as it taxied towards the runway.

Ryanair denies the plane was taxiing but admits it had moved off its stand.

In a statement the airline said one of its co-pilots had asked to travel home to Esbjerg as a supernumerary crew member.

The airline's statement confirmed that the co-pilot, who had a fully authorised air-side access pass and was wearing full reflective clothing, did board the plane.

"He boarded after the aircraft had pushed back early from the stand, and before the engines had been started up.

"While it was unorthodox and the co-pilot was disciplined, there was no breach of safety procedures and no delay to the aircraft.

"The flight continued onwards on its journey and arrived 22 minutes ahead of schedule in Esbjerg."