EDIT: When I checked after work today 23/10/2012 I found that all 5 bolts where loose!! Tightened them up, problem fixed.I noticed yesterday a strange clicking/tapping noise while driving, its as if there is something stuck to a wheel and everytime the wheel goes around it hitting the mudflap the noise isnt that noticeable when you speed up only when your at slow speed and I havent been able to hear it in reverse.
Now the only thing I have remotely done near any of the wheels is I have recently fitted mudflaps (the day before) and I have removed the rear wheels to fit them.
I have had a look around, nothing seems loose, and I cannot see anything on any of the wheels. the sounds appeares to be coming from the rear passenger side of the car?
Someone has suggested this could be my driveshaft?

Any ideas would be a great help.