Arun
Iis not Shrewsbury, the buildings are wrong for there. The GW was responsible for the signals and the signal gantry above the train is pure LNW as is the partially hidden signal box in the background. It also looks as though there is at least one bi directional platform road. 45003 was a western division engine since 1935 so somwhere on that division, the lack of signs of resignalling or electrification may narrow things a bit.
I have some slight variation in the locomotives later allocation dates,
Rugby 5/6/43, Willesden 31/10/53, Crewe N 14/4/56, Crewe S 20/10/56, Crewe N 5/1/57, Crewe S 23/11/57, Stoke 20/6/59, Crewe N 12/9/59,
Stoke 10/6/61, Wdn w.e. 27/5/67.
Martin