London bus strike: What commuters and tourists need to know
Only 44 out of 673 bus routes are running due to a 24-hour bus strikeGetty

London bus drivers have gone ahead with a 24-hour strike, as part of a campaign over pay and conditions.

The stoppage was organised by members of the Unite union across 18 bus companies. Only 44 out of 673 bus routes are expected to be operating today (13 January), leaving millions of commuters struggling to get to work.

Services were affected from 4am, with buses operating on Wednesday morning also likely to be disrupted.

Transport for London has warned that journeys were likely to be "significantly disrupted" as only 30% of buses were running this morning.

Unite has said there is no collective pay deal between drivers, meaning that there are 80 different pay rates for drivers doing the same job as wages were negotiated depending on the company. The union said hourly rates can vary by more than £3.

TfL said less than 16% of the bus drivers in London voted in favour of industrial action. A survey of 1,600 bus passengers for Unite showed two-thirds backed the campaign.

The services affected include: Abellio London, Abellio West London, Arrive North, Arriva South, CT Plus, Go Ahead, London Sovereign, London United, Metroline, Metroline West, Stagecoach, East London Bus & Coach Company, Selkent and Tower Transit.

You can follow @TflBusAlerts on Twitter for updates throughout the day. Bus passes and tickets will be accepted on the Underground, DLR and Overground on Tuesday due to the strike.

How long does it take to walk between tube stations?

TfL has warned commuters to check the website for updates on bus routes and London Underground services. However, the walking map - shared on social media with the hashtag #WalkLondon - is a good alternative for those wanting to avoid public transport.

What bus routes are running?

The routes not affected by the strike and running a normal service are below:

66: Romford Station to Leytonstone bus station

142: Watford Junction to Brent Cross Shopping Centre

160: Catford to Sidcup Station

258: Watford Junction to South Harrow Station

268: Golders Green Station to Finchley Road

288: Queensbury to Broadfields Estate

298: Arnos Grove to Potters Bar

303: Edgware Station to Colindale

305: Edgware Station to Kingsbury Circle

340: Edgware Station to Harrow Bus Station

346: Upminster Station to Upminster Park Estate

370: Romford to Lakeside Shopping Centre

375: Romford Station to Passingford Bridge

404: Coulsdon to Caterham-on-the-Hill

406: Kingston to Epsom

411: Kingston to West Molsey

418: Kingston to Epsom

428: Erith to Bluewater Shopping Centre

463: Coulsdon South Station to Pollards Hill

465: Kingston to Dorking

467: Hook to Epsom

470: Colliers Wood Station to Epsom

492: Sidcup Station to Bluewater Shopping Centre

499: Gallows Corner to Heath Park Estate

626: Finchley Central Station to Potters Bar

628: Kingsbury to Southgate Station

631: Golders Green Station to Henrietta Barnett School

641: West Molesey to Teddington School

642: West Hendon Broadway/Edgware Station to London Academy

653: Muswell Hill Broadway to Kingsbury

683: Friern Barnet to Kingsbury

688: Southgate Station to Kingsbury

B12: Erith to Joydens Wood

B13: Bexleyheath Shopping Centre to New Eltham Station

B15: Bexleyheath Shopping Centre to Horn Park

E10: Northolt to Ealing Broadway Station

H2: Golders Green Station circular (via Hampstead Garden Suburb)

H3: Golders Green Station to East Finchley, Hilltop

H18: Harrow Bus Station circular (via Pinner & Wealdstone)

H19: Harrow Bus Station circular (via Wealdstone & Pinner)

K5: Ham to Morden Station

S1: Banstead to Lavender Fields

S3: Sutton Hospital to Malden Manor Station

X26: West Croydon to Heathrow Airport