Very interesting to see folks talking about Lincoln High Street box.
I was a signalman there in the 70's before the barriers were installed so I might know something about the box. Out of interest there use to be a "fish dock" siding on the up side running towards the box steps. One Saturday evening I put a class 37 in there to run round the Blackpool summer working. As it got clear of the point ends it spread the road and that was that for a while. After that the siding was limited to class 03 and 08 only.
Additionally I worked at Greetwell Junction and Pyewipe Junction in Lincoln.
My first box was Burgh le Marsh on the East Lincs line.
If my memory works OK and I can help anybody with anything I will be happy to do so.