I have only had my 2013 xs for two weeks, have done a couple of long trips in it and it drives superbly
BUT
it has made a few very strange clunks, normaly when pulling away from a junction and changing into second gear.
It is best described as being like brake drums have stuck and just released. My first thought was a bush in the rear suspension (you can feel it) but i can find nothing. I cant make it happen, it can not happen for ages and then it does (as with all annoying noises) almost like the brakes are staying on after stopping then releasing as you set off.
Ideas?

Handbrake? are you sure its from the rear?

posotive its the rear, passengers in the back hear/ feel it
im being anal about making sure the handbrake has been released to rule it out

Could be Haldex cutting in:

If you got it from a car dealer ask them to cure it.

Check your tyres are all the same type and depth if not the Haldex will be working overtime. FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current