OK, so an independent garage where i work did me a favor and took a look.
Its the exhaust... Miltec 3", where the cat is, its hitting down just behind where that bracked with those two red bits are. Can see the marks on the cat!!
I have contacted VWR, told them, im calling back next wednesday... and then booking it in... im guessing the shape of the bend isnt right...
Although thats the noise, why its moving around makes me think its down to hop, causing it to travel up and down...