Boston were covered by Screensport many times in the 80's. I know for certain that 1984 Edinburgh 1986 Poole, Rye House and Long Eaton were filmed. One of them meetings were scrubbed off the master tape. I have 'em all somewhere.
Incidentally when Tommy Rander and his company Transmission TV and Media provided the pictures in the late 80's Mike Bennett, Warwick Mead and myself were amongst the staff. Clive Fisher did the commentary.
Mike Bennett worked for Paul Bonner in 1987 the year when British League coverage overtook National League.
I can remember Edwin Overland, Dave Lanning, Chris French and others also providing commentary. Dave Lanning for me the voice of TV speedway, but Edwin didn't do a bad job either.
I would be interested to see footage from the following tracks that I visited but are now long gone.
Weymouth, Scunthorpe (Both Quibell and Ashby), Birmingham (Old Perry Barr).