That's a very impressive bit of research and photos about the location of the Class 40, Mick
@mickoo, now re enforced by the comments and photos from Dave
@Yorkshire Dave , Martin
@40057 and memories from Richard
@richard carr and Roger
@Roger Pound . Thanks also, Paul
@hrmspaul for the detail and reference photos for the MML. Thanks also, Mick
@mickoo for all that info about the Deltics - if there was one person to know it's you and I was hopeful that you'd fill in the blanks.

A favour though, please Mick. Would you add an img number to your descriptions for me... I've tried to match the photos but my head is spinning!
This group of photos were taken in October 1979. The first two are of Loughborough Midland Station and the next four of unidentified blue Class 45 or 46 diesels at Loughborough.
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Another shot at Loughborough Midland in October 1979 but this time of Class 25 25270. It was introduced when new to Eastfield as D7620 on 26th August 1966 in two tone green with small yellow warning panel. By May 1971 it was blue with full yellow cab front and became 25270 in June 1974. After Eastfield home allocations were Preston Division July 1968, Nottingham Division November 1968, Bescot November 1973, Toton June 1974 where it was withdrawn on 28th November 1982 going to Swindon Works where it was scrapped on 30th June 1986.
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Another unidentified Class 45 or 46 diesel at Loughborough Midland in October 1979.
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A pair of class 20 diesels, 20073 leading, the geography showing it to be at Loughborough Midland in October 1979. This loco went new to Eastfield on 19th July 1961, then Polmadie in March 1969, back to Eastfield the following June and then the Nottingham Division from November in November 1969 where it was withdrawn on 23rd December 1993 going to C F Booth at Rotherham where it was scrapped in April 2006. The original number was D8073 and it was renumbered 20073 in March 1974. When introduced to traffic it was green with grey rood and red buffer beams but I have no information about when it was repainted blue. (BR Database).
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Brian