FlixBus – an operator quite new to the UK – has launched a Cambridge-London coach service. It operates 7 days a week and serves Cambridge Parkside, Trumpington Park & Ride, Finchley Road, and Victoria Coach Station. The number of services operated is between 1 and 3, depending on the day of the week and the direction of travel. Fares seem to start at £4.99 one way.
This service is operated by Whippet on behalf of FlixBus.
For more information, consult the FlixBus website.
Cambridge Area Bus Users 
It’s a shame this doesn’t serve Stratford (to which, unlike London, coach can have a competitive journey time).
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