I decided to take the wheel off and inspect the tyre.
Unfortunately there is a tiny hole in the sidewall - there is no debris left the hole and I’m at a loss as to what has caused it. Nevertheless, the decision to buy a new tyre has been made for me.
I’m now off to see if there’s been any malicious activity on my dash camera!
Ps
Just checked the Dashcam and nothing recorded - maybe it’s just my suspicions mind!
As a footnote- the wheels and tyres were fitted by a BMW main dealer last July - in order to get the wheel nut loose I had to use a socket on a breaker bar then use a 1.5m pipe.
They must have have used a windy hammer gun set to 11