SILVERSTONE, England (Reuters) – Seven-times world champion Lewis Hamilton backed down in a spat with Formula One’s governing body and removed a nose stud before taking part in practice for the British Grand Prix at Silverstone on Friday. An FIA spokesman confirmed the Mercedes driver was compliant with the rules and the stud had gone. Hamilton also has ear piercings, and another elsewhere on his body, and has maintained he cannot remove some without assistance. The 37-year-old was engaged in a standoff with the FIA in May, after drivers were reminded that wearing jewellery in the cockpit was …