Micra 1998 Equation clicking noise in rear passenger side?

I drive a 1998 Nissan Micra Equation 1.0 ltr and so far it's been great. However when driving along I hear a clicking rattly noise from inside the car on the passenger rear side. It sounds like it may be coming from the seat belt or inside the seat. I have tried folding the seats flat and clipping them back into place again but its still the same. It's a fairly quiet noise but it can be annoying while driving. I have also tried clipping all the rear seat belts in place. Does anyone know what it might be?
 
Check the rear seat buckle if loose!!

J
Thanks I'll have a look. Word of warning regarding Micra seatbelts. My sister sat in the back and pulled the front passenger seat belt into the rear clip and it would NOT come out. It took several attempts to pry it out with a screwdriver to remove it. However the clicking sound had started way before this incident.
 
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