Hi guys.
Today I've stripped the parcel shelf to replace what I thought was a blown sub in the Bose system. Turns out the sub was not the issue and the rattle is still present. I discovered this after fitting the new one supplied very quickly from A8 Parts!
So now the original sub is free for anyone that wants it but it's collection only from the Wirral.
As far as I can tell, there's no issue at all with it. The rattle was not cured with the new sub. I've seen my arse with it today having spent more money on it and all I've managed to do is somehow create an open circuit to a keyless entry sensor!