For posterity:
Further to the response below, please be advised that Democratic Services have conducted an extensive manual search of their records and have provided the following information, which is attached:
1) Works Committee report - 7th September 1987 - to consider and ratify the recommendation of the Working Party minutes (see below). (https://drive.google.com/uc?id=1sYdBr0IsCmi5_qBNp_5REwjrT0b04KbD)
2) Works Committee minutes - 7th September 1987 - showing the ultimate resolution on Eton Road. (https://drive.google.com/uc?id=1lo3ih85JZuOt8sg_mHvy27xhKk02lXqf)
3) Working Party minutes - 15th June 1987 (https://drive.google.com/uc?id=177zTJEwmvED7d6ulom5s2ZKkyc4M7EMy).