Tomorrow (28 November 2014) is the second day to take advantage of “Fare Free Fridays” – where all contactless Mastercard holders can travel free on the majority of London’s TFL transport network.
The TFL network includes London Underground, London Buses, London Overground, Docklands Light Railway, participating National Rail services in London and the Tramlink.
From 4.30 am on Friday 28 November until 1 am on Saturday 29 November, simply pay for your journey with your contactless Mastercard (not your Oyster card), and your fare will be refunded within 28 working days, up to a maximum of £21.80.
Full details can be found here. Note that despite what this link suggests, you don’t actually need to register.
Prefer to travel by London taxi? Here’s £10 free credit.