Lets concentrate on DGLICK 's problem not a history lessen in regards to your vehicle.
DG Despite what the garage has told you and I don't dispute what they have to say, but a significant defect is eluding them and you.
Sadly, you chose not to fully answer the question that I asked in my attempt to help you !
ARE THE WHEELS AND TYRES NOW FITTED BRAND NEW - IF NOT DID THEY COME OFF A VEHICLE INVOLVED IN AN ACCIDENT - Has any body inspected each rim and carried out a run out check with the tyre removed - has anybody carried out a run out check of the discs and hub face - do the people doing your work know how to do that.
Earlier you said that you had some Brake work carried out - what exactly ? Were the Discs replaced - was a disc "run out" check carried out and the results recorded.
I am still convinced from your description that the problem is confined to a rotating assembly.
I await your response
Oldtimer