Lewis Hamilton has worked with Peter Bonnington ever since he joined Mercedes in 2013. The partnership between the driver and race engineer has been the most successful in F1 history. Hamilton has won six world championships during his time at Brackley, in addition to 84 Grands Prix. He ended a two-and-a-half-year drought when he took victory on home soil last month. After an emotional exchange on the radio, Hamilton shared the podium with Bonnington. It was an indication of the strength of their bond. But with the 39-year-old headed to Ferrari at the end of the season, there have been questio…