This fix was done by previous owner but soon after I bought it the clicking started, and sounded like a bag of nails when negotiating speed humps, manoeuvring etc.
Anyway, I removed the drive shafts, I could see that copper grease had been used. Cleaned it all up but applied Lucas Oil x-tra heavy duty grease.
Clicking / rattling noises now gone, really pleased as it did sound awful and was getting on my nerves!
Tips for anyone doing this... 1) don't use copper grease 2) you can buy a 32mm deep socket for £2 from b&q 3) I used the handle from my old car jack as a breaker bar.