A Sunday morning trip to Bescot and Saltley with my mates (courtesy of my father who was behind the wheel) always yielded results in 1980s without the need trespass as both depots could be viewed from a public right of way. Bristol Bath Road was another favorite and when I went back to Bristol years later its disappearance came as a real shock.
As my father had a senior position at BR I didnt dare attempt any shed bunks but I remember going on two or three official tours round Toton with its 58s, 20s and 47s and later on the 45s laid up for scrap. I can also remember an official trip round Stratford as a school boy which was quite an adventure given that Id travelled down from Derby alone that morning!
Speaking of Tinsley I can remember attending a depot open day there. And on a later date Worksop and Shirebrook joint depot open days. Coalville was another favorite open day with the shuttle service from Derby which I think went via Sheet Stores and Stenson Junctions. Always a good line up of celebrity locos from what I remember.
As a lapsed enthusiast of many years (girls, uni, career and family commitments) how much has gone forever has come as a real shock. Back in the 1980s the Platform 5 spotters books showed locos allocated to dozens of different depots. Even the smaller depots like Etches Park and Leicester still had plenty of shunters allocated to them. Even places like Wellingborough often still had locos stabled there.