Speedometer sticking at low speed and reading incorrecty.

My wife's 1995 Micra K11 (1.0 litre) speedometer has started to stick at around 20 mph and will sometimes not drop after coming to a halt. In addition the speed readings do not appear to be accurate particulalarly at lower speeds. I am fairly sure it is a cable drive as opposed to an electronic one. I am quite happy to attempt a repair but need to know where to start. Is it just a question of lubricating/replacing the cable ? Can the the speedo head be lubricated ? The needle does drop if the instrument cluster is given a sharp tap. Any help greatly appreciated.
 
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