D10xx 1971c Derby
The 1H51 working approaches Derby with a Western in charge around 1971-72. The black patch around the lower marker light might help identify this Western - it looks like it has a shortish name. Could be D1069 as it has an unmatched unpainted repair at the bottom corner of the cab and D1069 had a weld here until the end.
In 1971 there was a regular 1M52 9.40 Bristol-Derby summer Saturday relief which was booked for a class 52, returning as 13.15 to Paignton. The service terminated at Derby and then formed a return working back to the WR as the 1V88 13.15 Derby - Paignton. It frequently arrived with a Class 47, but on some days we were lucky!
Class 52s noted on this service during the summer of 1971 were:
D1021 June 19th 1971
D1060 June 26th 1971
D1036 July 24th 1971
D1020 August 7th 1971
D1038 August 14th 1971
D1061 August 28th 1971
If it was one of those occasions, (with the incorrect headcode?) this loco will be either D1038, D1060 or D1061.