Have a Samsung phone? If you download the Samsung Pay app (click the given link) and register for this offer by going to the promotions section on the app, when you spend anything on Samsung Pay you'll get a free £3 Costa voucher.
It worked for this weekend, but there was an issue in finding the app on the Play store – it was available on the Galaxy App Store though!
You'll need a phone newer than the S6, or the Gear S2 or S3
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