Conversation so far:
Are there any other interesting aspects about the Peter Tatchell article?
To avoid conscription into the Australian Army, Tatchell moved to London in 1971.
what happened after Peter Tatchell moved to London?
He had accepted being gay in 1969, and in London became a leading member of the Gay Liberation Front (GLF) until its 1974 collapse.
What is Bermondsey for Peter Tatchell?
In 1978, Tatchell joined the Labour Party and moved to a council flat in Bermondsey, south-east London.
What was Peter Tatchell elected to in Bermondsey?
At the Bermondsey Constituency Labour Party's (CLP) AGM in February 1980, the left group won control and Tatchell was elected Secretary.
What happened after Peter Tatchell was elected secretary?
When the sitting Labour MP, Bob Mellish, announced his retirement in 1981, Tatchell was selected as his successor, despite Arthur Latham, a former MP and former Chairman of the Tribune Group, being considered the favourite.

Question: What was this position he was successor for?
Self-contained rewrite: What was the position Peter Tatchell was successor for?