My last comment on this subject will be the identification of the locomotive.

My last comment on this subject will be the identification of the locomotive.
The poster shows an ex LSWR loco # 755 of the N15 class. A similar unit is seen here (# 777) on the Great Central Railway (Loughborough). Some modifications have been added.This one has wind deflectors that give it quite a different look.
Anybody is welcome to correct me if I'm wrong.
Photo from Internet.