1970 Greater London Council election
The third election to the Greater London Council was held on 9 April 1970 and saw a Conservative victory with a reduced majority. == Electoral arrangements == New constituencies to be used for elections to Parliament and also for elections to the GLC had not yet been settled, so the London boroughs were used as multi-member 'first past the post' electoral areas.
Source: Wikipedia — 1970 Greater London Council election (CC BY-SA 4.0)