You MUST NOT park on a crossing or in the area covered by the zig-zag lines. You MUST NOT overtake the moving vehicle nearest the crossing or the vehicle nearest the crossing which has stopped to give way to pedestrians.
192. Pedestrian crossings - General
In queuing traffic, you should keep the crossing clear.
193. Pedestrian crossings - General
You should take extra care where the view of either side of the crossing is blocked by queuing traffic or incorrectly parked vehicles. Pedestrians may be crossing between stationary vehicles.