Justine Greening, MP and Secretary of State for the Department for International Development was one of the first people to try out the latest Jaguar XFR-S - on the same day she checked in her old Golf for its latest MOT.
Generally she's all in favour but apparently "hayfever sufferers should take particular care: a violent sneeze could easily pit 10 mph onto your speed."
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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.