Convenient contactless and mobile payment options are a dime a dozen these days, but that isn't discouraging Fitbit from throwing its keys into the bowl. After launching in the US and elsewhere during recent weeks, Fitbit Pay is now live in the UK, if not with a few catches. For starters you're going to need one of Fitbit's new £300 Ionic smartwatches, the company's first wearable that isn't geared solely towards activity tracking. Then there's the fact that at launch, it only supports Starling Bank, one of the UK's relatively new, branchless outfits that digs into your payment data to help you better manage your money from your mobile.