The examiner will provide instruction whilst on the move and will instruct the pupil to:
Pull up on the right when it is safe to do so, please. I’d now like you to reverse back for about 2 car lengths, keeping reasonably close to the kerb.
The DVSA states that if a vehicle pulls up in front, the exercise will continue. However, in the event another vehicle pulls up behind your car and stops the test candidate from reversing, the manoeuvre will not continue. The examiner will ask the test candidate to drive on and another manoeuvre will be carried out later during the test.
During the pulling up on the right manoeuvre, the test candidate is left to their own abilities in terms of observational safety. So if a car does pull up behind preventing the candidate from reversing sufficiently, the examiner should provide assistance for moving off safely if the test candidates view is obscured. See pulling up on the right for further information and tutorial.