Well I got it all sorted now thankfully and it only cost me £10. Here's what happened... I was driving down the M6 south this morning in the slow lane and I hit a massive pothole I couldn't avoid as there was somebody on my inside, the last time I had took all the alloys off was to clean all the arches before winter kicked in, so whats happened is I obviously I didn't tighten up the bolts enough on that alloy wheel
and hitting the pothole just loosened them all up, and the knocking was the alloy hitting the hub and shaking the car. It only clicked when the tyre guy was taking off the alloy and told me the locking nut was missing
Luckily nothing bad came of it and it cost me next to nothing to get fixed, it's a lesson learnt and I won't be making that mistake again !