[reggit]

Took it on the motorway for the first time since I bought it yesterday and from 60mph upwards it was shaking like a pig from the back end, although not consistent.
Had a think about it and there was nothing obviously wrong, other than mixed brands of horrible Chinese tyres (highfly & davanti). Started thinking that it was likely one of these had developed a flat spot, causing the rubbing noise and shake.

It’s been in to have 2 more tyres fitted and the rubbing noise has gone. Won’t be able to get to a motorway to test it at speed for a couple of days, but I’m fairly confident it was a duff tyre causing the shake.

It’s now got 4 matches, reasonable quality boots on it (at £100 each!)