Tomorrow and 28 November are “Fare Free Fridays” – where all contactless Mastercard holders can travel free on the majority of London’s TFL 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 14 November until 1 am on Saturday 15 November (and the same times on Friday 28/Saturday 29 November) simply pay for your journey with your contactless Mastercard, 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.