Here's The Enfield (Prescribed Routes) (No. 4) Traffic Order 2023 (https://drive.google.com/uc?id=1JJxDMrORbnm0CW073kDLljuU0Bbto6pa), it has some interesting drafting:
“the Bull Lane bus gate” means that part of Bull Lane situated between a point 2.5 metres south of the northern kerb-line of the entrance to the yard outside No. 22 Bull Lane and a point 14.2 metres south of the southern kerb-line of that entrance.
That suggests that the bus gate starts roughly halfway across the entrance to the yard, which is quite obviously more than 2.5 metres wide: https://maps.app.goo.gl/37oP7dmDwZDrtgei9
but that's not where the signs are situated.
Did you submit a representation?