The vein identification tech originally comes from Hitachi, and has been used by Barclays business customers for a few years now -- elsewhere in the world, it's employed in all kind of scenarios where robust authentication is necessary. Fingopay specifically was piloted at a Camden bar earlier this year, but makes its retail store debut at the Brunel Uni Costcutter. Visitors pair a debit or credit card with their vein profile once and only need to use their finger to pay for purchses thereafter.

The Costcutter group says it might consider rolling the system out more widely, and Sthaler says it's in "serious talks" with other supermarkets, too. We'd argue the likelihood of the Fingopay system hitting your local Tesco in the near future is pretty slim though, considering many supermarkets have only come round to contactless payments in the past couple of years.

Fingopay isn't really that much more convenient than pulling out your smartphone or contactless card, but it could be a sign of things to come. Amazon is testing out retail "Go" stores that track you and what you're putting in your basket, charging you automatically when you stroll out the door with your haul. There are several tech concepts aiming to make the checkout process as convenient as possible, and when we finally arrive at a best-fit solution, biometrics will likely part a play.