Had a good look underneath and noticed the exhaust "flops" about.
Popped into my loacl Les Smiths and made the poor manager (thanks Pete) did out all the exhaust books he had.
Seems I have what looks like Ford Escort rubber mountings fitted ! Just a rubber band ! No wonder its bangs and rattles (and hits the prop shaft).
So £14.40 later, all 9 rubber supplied waiting to be fitted ... this weekend.
Still got a knock from the front n/s suspension.
Have changed the lower arm/bushes/swivel.
Thinking about the shocks ?