Never went away fully but the vibrations are back with a vengeance. Car had been sitting in a car park for 4 days and on the drive home between 60-70mph the steering wheel starts doing the electric boogaloo again so I'm not sure how it suddenly got so bad when it's been parked up. Front wheels have been balanced and four wheel alignment done a few weeks ago. Perhaps I should pop the rears on the front. I hate it when there's vibrations.