One Strava user suggested that the mystery rider is Tyler Hamilton, the doping-tarnished former colleague of Lance Armstrong. Bizarrely, the avatar linked to the account is an image of Armstrong himself, smiling in a yellow jersey. And Armstrong has been known to use “J P” to check into hotels discreetly in the past. It stands for Juan Pelota, which is the name of the café in the bike shop he owns in Austin. But surely Lance couldn't ride around in the UK inconspicuously?