The record is available on the Avon County Website here
Avon Closed Championships History | Avon County Table Tennis Association | TT Leagues
It is also mirrored on the Bristol Websites here
Avon Champions - Bristol Table Tennis League (tabletennis365.com)
and here
Avon Champions | Bristol Table Tennis League | TT Leagues
If anyone can help with the missing entries please contact John Ruderham or Clive Ellison.