Red Bull principal Christian Horner has made it clear that the Toro Rosso junior squad isn't expected to play the part of test team for the rest of the 2018 season. Speculation about Toro Rosso's role was sparked by comments from motorsports consultant Helmut Marko. He said Red Bull wouldn't object if engine providers Honda pursued a programme of upgrades, even if this incurs big grid penalties. Each driver is only supposed to use three sets of power unit components during the year. Both Pierre Gasly and Brendon Hartley have already exceeded the limit ahead of the midway point of the season. Encouraging Honda to introduce more upgrades despite the threat or penalties would potentially...
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