Thanks for your further details about the possible location of that photo of the Class 45, Dave
@Yorkshire Dave . I guess we'll never know but it points us towards some further options. As for Class 45s being rare on the ECML please see below...

I have to accept, though, that it's more than two decades before Tim's photo so probably has no relevance to this discussion at all.
Thanks for yours about the possible ground too, Martin
@40057 . There are some other alternatives for chalk, of course, and again I suspect it offers options but no more than options.
Now to pictures in the UK and for quite a few upcoming posts steam in the declining years. Tim spent a lot of time at Waterloo and on the Southern as it was the final steam in London but he also travelled a good deal. He never really got to grips with colour film in the same way he had so successfully with black and white but that's not to say that there are no stunning images upcoming and of interest.
Class U 2-6-0 31639 and Class N 2-6-0 31411 at an unknown location with the Wilts and Hants rail tour of 3rd April 1966. 31639 was allocated to Guildford in December 1963, withdrawn in June 1966 and scrapped at Cashmore’s, Newport in September the same year. 31411 was also allocated to Guildford but in January 1965, being withdrawn week ending 24th April 1966, so very shortly after operating this train. It also went to Cashmore’s, Newport and was scrapped in September 1966. (BR Database)
It’s rather difficult to put any info to this photo. I believe the loco is 35028 Clan Line but the date is not known. The absence of a smokebox numberplate and shed plate suggest it's some time towards the end of steam on the Southern and may help to date the photo if my identification of the loco is correct. Next to it is what I understand to be a 4-SUB unit, 4742 which was probably built in the early 1950s. The Merchant Navy was at Stewarts Lane from April 1950 right through to September 1964 when it moved to Weymouth Radipole, then to Nine Elms in April 1967 where it was withdrawn in July the same year. As we know this loco has had a very successful career in preservation and details are here:
35028 Clan Line
As for the 4 SUB there appears to be very little information available and I don’t even have a withdrawal date. The small yellow warning panel may also give some indication of date.
Could this be at Waterloo? If so it's a view I don't recognise.
Edit: Not 35028. This is 35008 Orient Line at Vauxhall. It is hauling the Farewell to Southern Steam Railtour on 2nd July 1967
Rebuilt Battle of Britain 34056 Croydon at Waterloo but regrettably I have no date. However, looking at allocations after December 1960 when it was rebuilt it was at Exmouth Junction (where it had been since December 1954 in original condition), moving to Salisbury in November 1963 where it was withdrawn in May 1967. There's no shed plate, though, which puts the photo towards the end of steam on the Southern and I'll guess that the photo is dated at some time between 1963 and 1967. It then went to Cashmore’s, Newport and was broken up during September the same year. The SLS noted it in store at Salisbury in August 1967. (BR Database). Small yellow panel EMU in the background.
Brian