Christian Horner has suggested Mercedes’ rules blunder in the Russian Grand Prix may indicate they are becoming complacent as a result of their continuous success.

For the second time in three races, Lewis Hamilton was cost a potential victory by not adhering to the regulations. At Sochi, he made two practice starts in the wrong place on his way to the grid, received a 10-second penalty and finished third to team-mate Valtteri Bottas.

It came in the same month that the World Champion had also missed out on an Italian Grand Prix triumph at Monza where, seemingly coasting to a win, he entered the pits when the red light was on to deter cars from doing so and was also penalised, ending the race in P7.