False dawn of hope I'm afraid, after having the top mount fitted the car felt a little tighter and I hadn't heard any noises.
Unfortunately the noise is still there, on a Friday I drive home (about 25 miles on A Roads) - then go out to the local supermarket which is approx 3 miles away, knocking is very apparent then.
Got underneath and had a good look nothing obvious, everything feels tight, you can't feel anything through the steering or pedals, handles steers and brakes fine......all a complete mystery.
Two sets of engineers have now had the car in, the last set did a complete car health check....nothing found...
Not sure what to do now