Is it a stone trapped in the disc? What mileage have you done, and how much meat is left on the pad ( I am wondering if it is a sticking caliper ). Try reversing backwards as fast as it safe to do and the slam your brakes on, does that stop it.
Don't think so as it's not constant, I can get the noise to kick in after putting the foot to the floor but even then it's not all the time , the car has done 10k miles
How far from your dealer, that sounds a warranty job if doing it under hard accelerating. If you are South Scotland you have got Lloyd Allroad in Carlisle as a good dealer.
But then it's not every time under hard acceleration, I'll contact ineos and see what they say. My closest actual dealer would be Edinburgh but not sure if I can put my car to a service garage as there is one closer
