It would appear that I'm experiencing similar issues on an 04 plate thats done 55k. I had a good poke round underneath but couldn't see anything obvious. Next step will be to disconnect the drop links and go for a drive. It seems to knock more when the car is going over offset bumps and dips (body rocking side-to-side slightly), which was making me think it was drop links more than anything else.
Does any have any tips for checking banana arm bush or ball joint aside from trying to lever around it? There is no visible wear on the bush, and the arm is in the centre of the bush when the car is jacked up. When the bush fails is the arm likely to foul the body at certain points of its travel? There are no marks on it. Ball joint cover looks ok, but it will be difficult to detect any play.
Also - has anyone got the car through MOT with this sort of knocking? Have mine in one month and wondering if I need to pull my finger out to get it fixed before then.
Thanks