The green cars represent the biggest UK deal in the Spanish brand’s history and its largest ever low-CO2 car deal.
The Seat Leon Ecomotive was chosen ahead of 50 other cars during the tender process, according to Seat.
British Gas has pursued several green policies in recent years, including the ‘Generation Green’ programme to encourage schools and communities to go greener.
As the UK’s largest energy supplier, British Gas has now reduced CO2 emissions of the entire fleet with the introduction of the Seat Leon Ecomotive. British Gas drivers will be the first in the country to drive the green fleet vehicle.
Seat’s Ecomotive technology, also available on the Ibiza supermini and Alhombra MPV, cuts CO2 emissions on the Leon by 20g/km to 99g/km and fuel saving measures such as Start/Stop technology, revised gearbox ratios and a recommended gear indicator.
The Ecomotive technology employed in the Seat Leon does not use electric or hybrid systems, instead the 1.6-litre diesel has been enhanced to offer greater fuel economy and lower CO2 emissions.
Labelling the deal as ‘historic’, Seat UK Head of Fleet and Business Sales Nick Andrews said: "The handover of the very first right-hand drive new generation Leon Ecomotives to British Gas is a significant moment for us."