Glad it's cured, it reminded me of my Scimitar GTE with the same problem when I was in Germany and I jacked the car up and checked the front end for play in bearings, rack and rod ends and nothing found.
Phoned the factory and they said does it only do it under braking and yes was the reply and they guaranteed it would be the front discs, so couriered them out to me - job jobbed.
It followed on from a bit of a moment on the Autobahn when driving at night we encountered one of their Ghost drivers driving the wrong way for a bet.