Well, listened to everyone, bought some ramps, took a rocker cover off. It was soooo clean and oily it did'nt seem right to muck it about. Put it back together again and went to Airfix for a sound check.
Of course it stopped about 20 miles into the journey
We're all sure it's the hydrological taplets. Did another 100 mile to make sure - lovely.
When they clatter they clatter
Thanks all