The team may well win races with Honda this year, just as it probably would’ve done with Renault, but it won’t be until 2020 and beyond that the true success of the relationship can be judged. Best the team doesn’t get ahead of itself before then.

Formula One teams get just eight precious days to test their 2019 machinery ahead of next month’s season-opening Australian Grand Prix. At the halfway mark, we can begin to draw some broad-brush conclusions.

Formula One’s teams had turned their attention to 2019 long before the dust had settled on the 2018 season, and this week’s first preseason test will be a key indicator as to which of them have planned wisely for the year ahead.

Lewis Hamilton and Sebastian Vettel at the 2018 Abu Dhabi Grand Prix.

The 2019 preseason starts today.

Has Honda really turned a corner in its fight for F1 credibility?

Red Bull Racing and Honda's logos.

Red Bull Racing’s Honda gamble is aimed at long-term success.

Toro Rosso's Brendon Hartley and Red Bull Racing's Daniel Ricciardo on track at the 2018 Monaco Grand Prix.

Red Bull Racing wants to choose Honda power for 2019 — but can Honda make it worth the team’s while?

Honda F1 boss Toyoharu Tanabe. during 2018 winter testing.

There’s a lot riding on Honda’s Canada upgrades.

Valtteri Bottas testing in Barcelona

Has Mercedes got the title wrapped up already?

The Honda logo on the 2018 Toro Rosso car

Honda has proved surprisingly reliable partnered with Toro Rosso during preseason testing.