I found the location of the beeping siren behind the external lower tailgate moulding, i removed the interior tailgate panel 2 clips and a screw by the closing handle and then gained accessing to the inside where there are 6 10mm nuts holding the exterior moulding on, undo all of them and the siren is positioned on the h
Nearside of the tailgate, I disconnected it and waterproofed both loom and siren incase I wanted to reconnect, the whole system still works fine and there is now no noise at all when using it!