Hi ya guys,
Was driving home on the moterway after work last night, noticed the brakes feeling a bit spongy (had to pump to get pressure) and then started to get a knocking noise when on lock from the front wheels. Popped off at the bro's on the way home (cheers for diagnosis and dinner bro

) and found that the main nut that holds the hub on had worked loose and was actually holding on by a single thread!!!
Got a mate to pop round and tighten her up, so all sorted now - but apparently this is quite common on s2's

So just wanted to warn people... if you get these symptoms, don't wait on it as I was pretty close to loosing my wheel and wouldnt want this to happen to anyone else.