Runnymede: Stewart Mackay, who was elected for the Conservatives in Addlestone North ward, has left the party to sit as an Independent councillor.
Spelthorne: Colin Davis, who was elected for the Conservatives in Staines ward, has left the party to sit as an unaffiliated Independent councillor.
Thurrock: The entire UK Independence Party group of 17 councillors has seceded from the party and formed the Thurrock Independents group. Among them is Tim Aker (Aveley and Uplands ward) who remains a UK Independence Party Member of the European Parliament.
Croydon: Thornton Heath ward, after the disqualification of Independent councillor Matthew Kyeremeh who did not attend any council meeting for six months. He was originally elected for the Labour Party but had been expelled from the party in March 2016.As there are full council elections in May, there will be no byelection.