Green candidate Rob Yates won the Cliftonville (Margate) Kent County Council by-election on 9 April 2026 with 2,068 votes (38.8%, +26.7 swing) against Reform UK's Marc Rattigan (1,767 votes, 33.1%). The seat had been vacated after Reform councillor Daniel Taylor was jailed in March for controlling and coercive behaviour. Green leader Zack Polanski and former co-leader Caroline Lucas campaigned in Thanet; Reform finance chief Robert Jenrick canvassed for Reform. This is the first ballot-box test of the polling parity first measured in and the first live instance of the attrition pattern .
The first ballot-box test of Labour-Green polling parity, and the first live instance of the 70-councillor Reform attrition pattern producing a live seat change.
