The re-established constituency id defined as being composed of the following as they existed on 1 December 2020:
The District of Sevenoaks wards of: Ash and New Ash Green; Cowden and Hever; Edenbridge North and East; Edenbridge South and West; Hartley and Hodsoll Street; Leigh and Chiddingstone Causeway; Penshurst, Fordcombe and Chiddingstone.
The Borough of Tonbridge and Malling wards of: Borough Green and Long Mill; Cage Green; Castle; Downs and Mereworth; Hadlow and East Peckham; Higham; Hildenborough; Judd; Medway; Trench; Vauxhall; Wateringbury; Wrotham, Ightham and Stansted.[3]
Following a local government boundary review in Tonbridge and Malling which came into effect in May 2023,[4][5] the constituency is now composed of the following from the 2024 general election:
The District of Sevenoaks wards of: Ash and New Ash Green; Cowden and Hever; Edenbridge North and East; Edenbridge South and West; Hartley and Hodsoll Street; Leigh and Chiddingstone Causeway; Penshurst, Fordcombe and Chiddingstone.
The Borough of Tonbridge and Malling wards of: Birling, Leybourne & Ryarsh (part); Borough Green & Platt; Bourne; Cage Green & Angel; East and West Peckham, Mereworth & Wateringbury; East Malling, West Malling & Offham (small part); Higham; Hildenborough; Judd; Pilgrims with Ightham; Trench; Vauxhall.[6]
The reformed constituency comprises the bulk of the preceding Tonbridge and Malling seat (excluding East and West Malling), plus an additional two District of Sevenoaks wards to the north - Ash and New Ash Green, and Hartley and Hodsoll Street, from the constituencies of Sevenoaks and Dartford respectively.[6]
The seat includes the commuter town of Tonbridge and its hinterland to the north, plus the smaller town of Edenbridge further west. Electoral Calculus characterises this area as "Strong Right", with right-wing economic and social views, high home ownership levels and strong support for Brexit.[7]
Another General Election was required to take place before the end of 1940. The political parties had been making preparations for an election to take place and by the Autumn of 1939, the following candidates had been selected;