I haven't had another puncture since switching to Schwalbe Marathon Plus tyres (as suggested above), although circumstances mean it's too early to be really sure the problem is fixed.
I'm still really p'd off about the time and effort wasted on punctures - it has spoiled the experience.
It's now 5 months since the Motus was delivered and I've used it to get to work most days over that time. Other stuff I've noticed:
The kickstand isn't very useful. The bike is very heavy and unless I arrange it carefully when putting the kickstand down, it tends to fall over.
The kickstand pivot is corroding, as are the pedals where they screw on to the crank arms.
The power adjustment buttons won't stay put on the handlebars - they spin round fairly freely despite the screw being done up as tightly as I can manage.
The cable routing for the rear light isn't great. It passes through the rear mudguard at the front and along under the mudguard. The clip which passes through the mudguard at the front, containing the cable, came loose and fouled the wheel, necessitating (yet another) tedious and messy removal of the rear wheel to remove it. I've binned the clip and stuck the cable back down with bathroom silicone rather than mess with it any further; it will presumably fail (eventually) when it wears through at the point it passes through the mudguard.
To be really picky, there's also:
The front light tends to adjust itself upwards over time, ending up shining too high. The rear light *can't be switched off* immediately - it goes off a couple of minutes after the front is switched off - which draws unnecessary and unwanted attention the parked bike, and "you left your lights on mate" etc. It's frustrating that the lights have niggles as they are separate from the Bosch system (which has the option to provide lights) and add the complication of the Shimano dynamo hub etc.
It's not that the Motus is a bad machine, but I'm very conscious that it's 2x the price of the equivalent spec Woosh and for that it ought to be really good.
For the avoidance of doubt, for anyone else reading this - I've got a 2015 Motus - I see there's now a 2016 model, although the spec seems very similar to the 2015.