- 11 Princes William & Harry
- 12 Nick Clegg, Deputy Prime Minister
- 13 Natalie Massenet, Net-a-porter founder
- 14 Bernard Hogan Howe, Met Police Commissioner
- 15 Sir Nicholas Hytner, National Theatre
- 16 The Queen
- 17 Harry Styles, One Direction
- 18 Justin Welby, Archbishop of Canterbury
- 19 Sir Paul Nurse, Royal Society President
- 20 Cara Delevingne, model
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Official readings are recorded three metres in the air but a study found levels of nitrogen dioxide (NO2) were higher at pushchair level.
Tubes, trains, trams, buses, cable cars, river buses, taxis and going by foot - your guide to getting around during the strike.
Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.