We've just been down south for a few days last week and I had the misfortune of going on the m25. Does it always sound like it's going to rattle the car to pieces? I didn't actually get up to 70, but it was pretty unpleasant at lower speeds.
Theres a section of the M25 (think its on the south west side) that made me think my Octavia had a blow out once due to the road noise it made. Was close to brown trouser moment considering I was in lane 3 or 4 at the time.
Ironically the Tesla sounds a bit healthier on that section but not by much.