Watch the terrifying moment a motorcyclist stood up to moped thugs near Marble Arch. Credit: SWNS

This the terrifying moment a motorcyclist stood up to moped thugs armed with an angle grinder who targeted him and his bike.

Nick Donnelly, 34, was riding through central London after a hospital appointment when the scooter-riding pair approach him at a red light and he felt something "in his back".

Start-up founder Nick turned on his camera and then sped off in order to escape the moped rider and their passenger.