From 29th February until 14th March travel free across Transport for London network on Mondays. Simply touch in and out using MasterCard with Apple Pay.
It’s a pretty generous deal, covering all travel on London Buses, London Underground, London Trams, Docklands Light Railway, London Overground, TfL Rail, most National Rail services within London – and even the Emirates Air Line cable-car. The maximum daily amount is set to £28.10, but the maximum daily cap on travelcards would normally kick in before then anyway (unless you keep going back and forth on that cable-car).
The way it works is that you’ll be charged as normal for your travel, and then receive a refund within 28 days. Unlike last time, there’s no mention of having to set the MasterCard as your primary card – you just need to select the card before touching in.