London and the south east had a swing to the Tories in 1979 that was 50% higher than the rest of the country. The GLC was already in Tory hands under the leadership of Horace Cutler. He was looking forward to a close working relationship with Thatcher around issues that would eventually move in his direction: the development of Canary Wharf, sale of council houses, the Jubilee line and a third airport. Cutler also thought his party would support an Olympics bid for 1988.
The GLC had traditionally been heavily involved in the provision of social housing but Cutler handed over stock to local boroughs and pushed for council house sales ahead of Thatcher coming to power and in the teeth of opposition from Labour, the left and housing groups.
Cutler believed London had given the Tories a huge endorsement and looked forward to a “happy time”. Unfortunately for him, Londoners turned on Cutler’s Conservatives in 1981 after two years of recession and the GLC ended up with Labour in control and Ken Livingstone.
Livingstone was able to link up with other Labour held metropolitan authorities like Merseyside and South Yorkshire. These sprawling urban councils had swung to Labour in 1979, defying the Thatcherite wave. The prime minister got her revenge in 1986 when she abolished all these authorities including the GLC.
Here is a punk rant against Cutler’s GLC from The Members