From £111,405

Flagship 5 Series has turned PHEV and promises to be BMW's most extreme super-saloon yet

It’s surprisingly comfortable, too. The suspension is firm, sure, but really well damped, not harsh and supremely controlled, to the point where I tended to leave the dampers in their stiffest mode. When road test ed Matt Saunders drove a Touring prototype in the UK, he found it coped well with bumpy Welsh roads, too, so the M5s new-found compliance ought to translate.

Which isn’t to say the M5 has become a laid-back cruiser: all that chassis tech gives it plenty of tools to entertain, up to a point. To no-one’s surprise, the adaptive suspension ensures tight body control, while the 285- and 295-section tyres generate enormous grip.

Select 4WD Sport and the halfway-house M Dynamic stability control modes, and all the systems work together to rotate the M5 neatly out of turns and inject an accessible and non-perilous sense of humour into what could be a very serious car. On a good road you can get into a nice flow, and the 2.5 tonnes melt away. Almost.

Push beyond that, though, and it can start to feel a little like uncharted territory. The steering doesn’t give much feedback, and I never felt sure whether I was going to get brutal traction, a gentle slide or a spike of oversteer. That’s probably when driving harder than most owners will tend to do, and I’m sure that on a track, in two-wheel drive mode, the M5 will still make a wonderful smoke machine.

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It was whispered during the launch that the Touring’s suspension is set up to be slightly more compliant than the saloon’s, but I drove the saloon one day and the Touring the next and couldn’t tell the difference. That's a good thing, and wouldn't be the case with an equivalent (but taller) SUV.

It’s worth noting that the M5 is the only 5 Series Touring variant to do without self-levelling rear suspension, so you might want to consider some deterioration in the handling when you decide to take the family, the dog and the caravan (it’s rated to tow 2000kg) on a track day.