hi jools
here's my photos of 951 and 952,and they look the same to my untrained eye
51 and 52 had the big headlights and 53 to 57 have the wipac.apart from that????
66951 Dagenham dock 19-2-2005
66951 Crewe works 10-9-2005
66951 tyne yard 8-5-2006
66952 Basford Hall 17-3-2007
66952 Dagenham Dock 18-6-2005,took with a very long lens
hope these help
sid