I thought the same about the wheel nuts Chris.
Maybe the wheel bolt holes/bolts are a bit worn causing the wheel to be off centre??
I must admit that the tyre place didn't give me much confidence as they didn't know what offset was!!!!
Any other reason why i should have have such a bad wobble? It only does it from 70mph upwards!!
Gearbox/driveshaft maybe,although the gear lever hardly moves.The steering wheel wobbles left to right just a bit but really fast!???????