Boris Johnson’s New Routemaster buses for London will be fitted with opening windows to prevent passengers overheating.

Transport for London (TfL) confirmed that the buses would be refitted with new windows on the top decks after passenger concerns.

There are 550 of the buses on London streets, at a cost of roughly £350,000 each, and a further 250 which are on order will also have the new windows.

“We’re pleased they’ve now been able to come up with an affordable and working design to install opening windows, which we anticipate will have been installed across our entire fleet by next summer,” TfL’s director of buses, Mike Weston, told the Evening Standard.