Thanks for the replies
I'm happy to meet nearer Castleford. Probably best in the retail outlet. this is only about 30 minutes away down the M62.
It's not the front struts or top mounting as I've had Monroe shockers fitted in January. The noise/knocks/groans were there before they were replaced. I've also had the inner tie rods replaced- all for £750, so you can see why I'm reluctant to spend anymore on something that may not be the culprit. I'm erring on the bottom ball joint, track rod end or drop links. How can you be certain which one it is?