I also have a knocking/clunking noise, I cannot pin point if it is front of rear.
Had my local garage look at it and they saw my W brace was completely rusted to nothing, so they did that for £300, the knocking was just as bad after that. Now they want to charge me £400 for the rear shocks as they think that will cure it.... Im not rushing into it, I would rather they knew 100% where the noise was coming from, which they should be able to do quite easily, as they deal with this sort of thing day in day out!!
Here is a video I found, the noise I am getting is basically identical to this...
Not sure if that is the sound your getting OP?