Queueing traffic and two lanes closed due to car fire on M25 clockwise between J15 M4 and J16 M40. Lanes one and two (of four) coned off whilst the fire brigade extinguish the fire.
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The Duchess of Cambridge has been driven to St Mary's Hospital in London in the "early stages of labour", Kensington Palace has said.
The Duchess of Cambridge has been on maternity leave since the week before Easter.
The Duke and Duchess of Cambrige have been together for 15 years and will have three children under the age of four.