The strike action , organised by members of the Unite union, will affect bus routes in south west London but also some routes into central London, including the 9/N9, 10, 94, 148 and C1.

TfL has stressed to commuters that bus services operated by other companies across the capital are unaffected and will operate a normal service on both Friday September 19 and Monday September 22.

Leon Daniels, TfL’s Managing Director of Surface Transport, said: “I’d like to apologise to our customers in advance for any disruption they may face tomorrow and on Monday. If you’re travelling in the areas affected then please do make sure that you check before you travel. Our teams will be working hard to get as much information out there as possible using a variety of channels.

“Bus drivers pay and conditions are a matter for London United and Unite to discuss, as it has been for 20 years, and we would urge them to seek a swift and fair resolution for the sake of our passengers.”

London United operates around 50 bus routes in London and the strike action is likely to result in severe disruption on a significant number of routes and some services not running.  Some Tube services in south London are expected to be busier than normal – so commuters are urged to allow more time to complete their journeys on Friday and Monday.

Strike action will take place over two 24-hour periods.  The first, between midnight ends at  11:59pm on Friday 19 September, will affect bus services on Friday 19 September and night bus services operating on Friday night into the early hours of Saturday 20 September.  Bus services during the day on Saturday 20 September should operate as normal.

The second strike, that takes place between midnight and 11:59pm on Monday 22 September, will affect bus services on Monday 22 September and night bus services on Monday into the early hours of Tuesday 23 September.  Bus services during the day on Tuesday 23 September should operate as normal.

TfL is calling for Unite and London United to swiftly resolve the dispute so that passengers are not disrupted.  TfL is also deploying extra staff to assist passengers at various locations, including bus stops and bus stations, and to hand out walking maps.

TfL is keeping passengers informed of the status of their services in a range of ways. These include:

Up-to-date information on bus services by route can be found at www.tfl.gov.uk/buses

Passengers can also check for bus arrival times using the Countdown next bus arrival service online, on their mobile devices at m.countdown.tfl.gov.uk or via our SMS text service.

A range of easily available Apps for handheld devices now use TfL's live bus information.

Travel alerts will be provided through Twitter on @TfLOfficial and @TfLBusAlerts – look out for #BusStrike.

TfL will also be providing information to radio and television broadcasts for use in news bulletins.

TfL will also have a number of additional staff across the network and at key locations to provide advice to passengers.

Where services are disrupted TfL urges passengers to use other transport options, or to walk or cycle where possible. The average bus journey is around 2.2 miles so many of these journeys could be made in this way.

TfL has put in place a number of additional measures to help people get around and to manage disruption. These include:

TfL is operating a full service across the Tube network.

Full services are also operating on the Docklands Light Railway, London Tramlink and London Overground networks.

TfL is also emailing registered bus users, who regularly travel on affected routes, advising them of the likely disruption and urging them to check before they travel.