Michael O'Halloran (British politician)
In 1983, the SDP chose John Grant, the MP for Islington Central (which was being abolished in boundary changes), to be its candidate in Islington North. O'Halloran left the SDP to stand as an independent Labour candidate in the 1983 general election. The official Labour candidate Jeremy Corbyn won while O'Halloran came in fourth with 11% of the vote. Grant came third with 22% of the vote.