Try the Museum of Berkshire Aviation (MuseumBerksAv@gmail.com) at Woodley. They may have pix of the ‘line’ at Vincent’s Garage. “Wings Over Woodley” (Julian C Temple) may be another source?
For the bigger picture then IWM might be a good bet. If they don’t have pix then they would probably know who does!
HTH
Resmoroh