You MUST NOT reverse your vehicle further than necessary.
204. Road users requiring extra care - General
The most vulnerable road users are pedestrians, cyclists, motorcyclists and horse riders. It is particularly important to be aware of children, older and disabled people, and learner and inexperienced drivers and riders.
205. Road users requiring extra care - Pedestrians
There is a risk of pedestrians, especially children, stepping unexpectedly into the road. You should drive with the safety of children in mind at a speed suitable for the conditions.