Cameras are set up on top of traffic lights for various reasons, including simply monitoring the traffic flow. So not every camera automatically records the fact that a vehicle has crossed the white line when the signals are at red.
Assuming, though, that the offence is recorded, then a fixed penalty notice would normally be issued. This would require payment of a �60 fine and the driver would also have to send his licence off. This would be returned with 3 points on it.
Chris