FINALLY the weather held out, so I was able to get over to Patch's house to have a look at my knocking noise.
The top mounts seemed ok, but Patch got the drivers side up, and got the top mount and bearings replaced. The old ones looked almost new, but were worn down a fair few mm over the new ones!
Then we moved over to the passenger side, jacked the car up, took the wheel off.
Patch: Your ARB isn't connected to the drop link
Nige: I thought you took the bolt out when I wasn't looking?
Patch: No I ain't touched it
/and the penny dropped!!
Since I got the suspension and ARB replaced in February, the old bolt must have come lose, and about 6 weeks ago it finally fell off!! When I jacked the car up and was fiddling with engine mounts the other weekend, I must have made the bolt pop out of the hole in the ARB, which is why the knocking suddenly got so much worse!
Quick trip to a local parts supplier and I had a new droplink for £10. Got that replaced, and did the passanger side top mount too. Took the car out for a spin, and it was lovely and smooth and no knocking, YES!!
Massive thanks to Patch! Really appreciate you sorting me out mate
