OK, I don't want to speak too soon. BUT!! I think it may be fixed... Its certainly ALOT BETTER. I took it to Skidz, in falkirk this morning whom took off all tyres so as to inspect the foam inserts. All dry, all fine. However, they said that the wheels had been balanced in a really odd manner by tesla. Counterbalanced or something?! He tried to explain to me something about chasing the weight from 12 o clock to 6 o'clock! Meh!.. And also said he'd never seen the Type of foam weights before that tesla had used (pics attached) . He wasn't convinced of their accuracy given they are cut to size. He balanced it properly, and so far, on the small amount of time I've had to motorway test it, it seems to have a marked improvement! Fingers crossed.