steering wheel vibration

This is driving me mad. I've got a slight vibration that disappears at around 55. I've had the wheels balance but made little different difference. Car sailed through MOT with no advisories. Car is running on 15" wheels. Tyres are virtually new all round. Pirelli P6000's at the front and Lassa Impetus sport on the rear



Has anyone out there got any suggestions what next to check?

from the last news http://ift.tt/1jcaEyf

via IFTTT