Hi Ben,
This is a great recording of Graham Gill on RNI and one I have had in my collection for many years. I have the date as 2nd November 1973, but I am not sure of that either! I will listen to the recording again. I have tried to work out a date from the news events, but nothing precise.
If it was the last night that String Driven Thing was the Smash Play then that would be an early Friday morning as the new Smash Play was revealed in the International Top 30 on a Friday night. I can't find a listing of Its a Game as the Smash Play, but probably end October/start November.
This is my copy which goes through until close at 0300.
https://www.mediafire.com/file/uszy4fd7o3isdvr/02111973_0052-0300_GrahamGill.mp3/file
You mention Colin Lees, was he from Yorkshire? I seem to remember the name.
Thanks
Ian