Highway Code Rule 243

DO NOT stop or park:

near a school entrance
anywhere you would prevent access for Emergency Services
at or near a bus or tram stop or taxi rank
on the approach to a level crossing/tramway crossing
opposite or within 10 metres (32 feet) of a junction, except in an authorised parking space
near the brow of a hill or hump bridge
opposite a traffic island or (if this would cause an obstruction) another parked vehicle
where you would force other traffic to enter a tram lane
where the kerb has been lowered to help wheelchair users and powered mobility vehicles
in front of an entrance to a property
on a bend
where you would obstruct cyclists’ use of cycle facilities

except when forced to do so by stationary traffic.

Section: Waiting and parking (rules 238 to 252)
Subsection: Parking (rules 239 to 247)