Talking of which, I see that the 6H10 Bletchley to Peak Forest has just lost 16 Minutes between Fenny Stratford and Woburn Sands, so I guess he was held on the double track section by the Cambridge Sidings! I see as I'm typing, he's made up 4 Mins by Ridgmont!
Ok on wishing you'd taken more photographs; we took for granted that things would stay the same forever.
I used to travel to work on the Cravens Units; although the motor unit rattled like no other, they were fairly reliable.