"Anyway, because of this I went for the Yamaha panniers and topbox, despite what Yamaha say about not fitting both at once. I've had no problems! I had to repair one lock on the ferry though and new locks are on order under warranty"

Bring the panniers back to a yam dealer and they will give you a new set as they did me. The locks have been upgraded and Yam sent a bulletin to all dealers to say so.