An express bus route between Heathrow and north London is due to come into service this weekend.

The SL9 between Heathrow Airport and Harrow bus station will start operating on Saturday (August 26).

The service is almost identical to the existing X140, but will now become part of London’s Superloop network, which aims to improve transport links in the capital’s outer boroughs.

The Superloop routes will benefit from USB charging points on buses as well as increased inspections and cleaning of bus shelters.

Three other Superloop services are already running – SL6 (West Croydon to Russell Square), SL7 (Croydon to Heathrow) and SL8 (White City and Uxbridge) – with ten planned in total.

TfL has announced other improvements to bus routes in north London, also starting on Saturday.

Route 123 between Wood Green station and Ilford, which currently does not run overnight, will become a 24-hour, seven-days-a-week service.

The frequency of buses will also increase on route 141 between London Bridge and Palmers Green.

The service will run every 10 minutes instead of every 12 minutes every day of the week in the evenings and throughout Sundays.

Mayor of London, Sadiq Khan, said: "The Superloop will be a gamechanger for travel around outer London, delivering quicker links between transport hubs, town centres, schools and hospitals.”

He added: “These new services will provide Londoners with even stronger alternatives to private car use, and help us to build a better, greener London for everyone.”