Yes, he would have immediately have contacted the signalman as soon as he stopped at the signal protecting the first landslip - either by calling the signalman or by pressing the "I'm sitting at a red signal like a c***! WTF are you doing?" button on GSMR. There would then have been the inevitable bit of waiting for authorisation from control and clearing trains off the route to be used to bring him back. The crossover points may also have required manual clipping before the movement (to lock them closed while the train passes over them - not all crossovers have automatic locks), which would have required a track-bloke or MOM to come and do it and that would have caused a big delay. Once the points were set and locked and the route cleared for the move, the signalman would then have authorised the driver to do the move.But wouldn't the driver have needed permission to wrong direction move over the points and this would have necessitated permission from the controller/signalman?
Also to slip sideways a little. Isn't this a damn good reason for requiring guards on all trains?