Wee update of this
Went out this morning and evaluated the spoiler further. Opened the boot and my Fiancee wiggled it and it never squeaked! So looked at my boot catch and thought hmm maybe it's that!? So wrapped black tape round it and closed the boot, went out earlier and no squeak!!
So after accusing my poor spoiler it turned out to be the boot catch squeaking on the metal bit on the bottom of the boot