Thanks for replying so quickly.
In reply to your questions,
I don't think that speed bumps affect the noise. What does affect the noise is an uneven road and the noise is much more pronounced when cornering right. Taking left-hand corners does not cause the noise unless the road is very uneven.
The noise is an intermittent clunk which is not felt through the steering wheel.
The car suspension was checked by a Ford dealer and found to be OK. They did however, change the nearside front linkage assembly the previous week. They also found that the offside alloy wheel had a dent so that it did not run true when rotated. They said this would not cause the noise I described,
I hope you find this information helpful.
I feel that the noise is coming from the underside of the vehicle and it is a loud knock.
I have tried slowly turning the steering wheel from lock to lock when stationery and there is no noise.
It doesn't happen when braking.
A mechanic did come out with me on a road test and he agreed there is something wrong.
I forgot to mention on the dealer's visual health check it mentions that the front flexi is weak. They gave it an amber status.
I hope you find this helpful.
Stones have already been removed from springs. I don't know if they have checked the subframe.
I am not sure what the front flexi is and whether weakness would account for the noise.