Similar to the Mastercard / Apple Pay promotion last year, Mastercard and Android Pay will provide free TfL travel (including bus, Tube and DLR etc) on four Mondays in October.

The only difference is that they are offering free coffee this time too!

Useful info from Engadget ( https://www.engadget.com/2016/09/28/mastercard-android-pay-coffee-tube-london/ ) copied below:

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In a bid to boost mobile payments, Mastercard kicked-off a series of promotional events last year where it would pay for Londoners' travel if they used its cards to tap in and out of the Tube with Apple Pay. It must have been a success, because today the card giant confirmed that it will do the same for cardholders with Android devices, allowing you to travel on London's travel networks for free every Monday throughout October.

All you need to do is have a Mastercard loaded onto your Android Pay wallet and then use it to touch in and out, like you would an Oyster or contactless card. The offer is available on October 3rd, 10th, 17th and 24th and covers travel up to £30.50 across bus, Tube, tram, DLR, Tfl Rail, London Overground routes and most National Rail services in London. It even covers Emirates Air Line cable car and the MBNA Thames Clippers River Bus service.

If that wasn't enough, Mastercard has also teamed up with Caffè Nero to offer a free coffee or hot drink on those dates. For both offers, you will need to pay for your travel and drinks initially, but Mastercard will refund the fare (which could take up to 28 days).

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Full Terms & Conditions ( https://www.mastercard.co.uk/en-gb/consumers/features-benefits/mobile-payments/android-pay.html ) below:

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Eligibility

This promotion is open to holders of a Mastercard® card issued by a UK financial institution with an Android Pay compatible device (4.4 operating system or above and NFC enabled).
Under 18’s will require guardian/parental consent to take part.
Offer only valid when using a Mastercard card with Android Pay.
The offer will be available during a series of eight Promotional Periods on four consecutive Mondays commencing 03/10/2016:
Promotional Period 1 (“PP1”) – TfL Travel Offer – 04:30 on 03/10/2016 to 01:00 on 04/10/2016
Promotional Period 2 (“PP2”) – TfL Travel Offer – 04:30 on 10/10/2016 to 01:00 on 11/10/2016
Promotional Period 3 (“PP3”) – TfL Travel Offer – 04:30 on 17/10/2016 to 01:00 on 18/10/2016
Promotional Period 4 (“PP4”) – TfL Travel Offer – 04:30 on 24/10/2016 to 01:00 on 25/10/2016
Promotional Period 5 (“PP5”) – Caffè Nero Coffee Offer – 00:00 to 23:59 on 03/10/2016
Promotional Period 6 (“PP6”) – Caffè Nero Coffee Offer – 00:00 to 23:59 on 10/10/2016
Promotional Period 7 (“PP7”) – Caffè Nero Coffee Offer – 00:00 to 23:59 on 17/10/2016
Promotional Period 8 (“PP8”) – Caffè Nero Coffee Offer – 00:00 to 23:59 on 24/10/2016

Transport for London Travel Offer
To redeem the offer, cardholders must use their Mastercard card with Android Pay for pay as you go travel on bus, Tube, tram, DLR, London Overground, TfL Rail, Emirates Air Line, Thames Clippers River Bus, Gatwick Express and most National Rail services in London during PP1, PP2, PP3 and/or PP4.
The offer entitles cardholders to receive a refund against their pay as you go travel costs made with a Mastercard card with Android Pay on bus, Tube, tram, DLR, London Overground, TfL Rail, Emirates Air Line, Thames Clippers River Bus, Gatwick Express and most National Rail services in London to a maximum value of £30.50 per cardholder, per PP1, PP2, PP3 and PP4. The offer is as stated and nothing else is included.
The refund will take up to 28 working days from the end of each Promotional Period to appear in the Mastercard cardholder’s account. Please note that the refund will be posted to the cardholder’s account by their issuing bank and will be dependent on Mastercard having processed the relevant transactions. Any queries relating to delayed or missing refunds must be raised within 2 months of the close of Promotional Period 4.
All qualifying journeys must be paid for using a UK Mastercard card with Android Pay.
Cardholders who use Mastercard with Android Pay must have an active account, with the requisite funds to cover their TfL travel costs during PP1, PP2, PP3 and PP4.
To qualify for the offer, you must touch your Android Pay device on a yellow card reader at the start and end of each journey made on Tube, DLR, London Overground, TfL Rail, Gatwick Express, Emirates Air Line, Thames Clippers River Bus and most National Rail services in London (or any combination of these) and at intermediate points where required. On buses and trams you must only touch in at the start of your journey.
Offer is subject to the TfL Contactless Payment Cards Conditions of Use located at http://www.tfl.gov.uk/terms.

Caffè Nero Coffee Offer
This offer entitles Mastercard cardholders to one any-size Espresso, Caffè Latte, Cappuccino, Americano, Caffè Mocha, Flat White, Standard Hot Chocolate or Tea.
Offer excludes additional syrups, extras, speciality drinks, cold drinks and all other food or beverage items.
To redeem the offer, cardholders can visit any Caffè Nero shop or express outlet in England, Wales and Scotland during PP5, PP6, PP7 or PP8:
When ordering the free coffee only, cardholders must present their Mastercard loaded within Android Pay to the Barista when ordering.
When ordering the free coffee with additional items, cardholders must present their Mastercard loaded within Android Pay and then tap to pay for any additional items with their Mastercard with Android Pay.
Maximum 1 coffee per cardholder per PP5, PP6, PP7 and PP8.
Anyone using someone else’s Android Device or attempting to redeem the offer more than once during either PP5, PP6, PP7 and/or PP8 will be refused the free coffee.
Caffè Nero staff reserve the right to ask a customer to show the verifying email address within the Android Pay app, proof of ID and/or the relevant Mastercard card if they have any concerns regarding the authenticity of the customer.
Caffè Nero staff reserve the right to refuse the offer to any customer where there are reasonable grounds to believe there has been a breach of these terms and conditions.

General
Offers subject to normal availability.
Offers cannot be used in conjunction with any other discount, offer or promotion.
To the fullest extent possible in law, neither Mastercard nor agencies involved in this promotion will be liable for any loss or damage whatsoever caused by matters relating to this promotion.
By redeeming these offers, Mastercard cardholders will be deemed to be bound by and have accepted these terms and conditions.
Any question concerning the legal interpretation of the rules will be based on English law and the Courts of England and Wales will have exclusive jurisdiction.
In exceptional circumstances, the Promoter reserves the right to vary these terms and conditions or withdraw the offer at any stage.