The adjacent tender has British Railways in full on the tender.

The lamp posts with white painted bases were at Gorton Shed.
A similar view of the opposite side of the loco with empty tender, smoke box door handles in identical position and same type tender in front suggests this is around 18-10-1959.
The 41H shed plate backs up this date as loco was transferred to Staverley GC three months earlier on 13/6/1959.