Mercedes say they will block any move to relax the rule restricting in-season engine development. Rivals of the new world champions are pushing for at least one development step during a season, in the hope of reducing Mercedes' advantage. But Mercedes say they cannot do that and continue to provide engines to customer teams at their current cost. Christian Horner, boss of Renault's works team Red Bull, says relaxing the rules is in the sport's interests. Horner pointed to Mercedes driver Nico Rosberg's climb from the back of the field to finish second in Sunday's Russian Grand Prix, in which cars with Mercedes engines finished in the first five positions, as evidence something needed to...
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