Many thanks for raising the subject Roger. It has come to light that one of the main sources of reference books for ships crests and mottos, TP Stopford Admiralty Ships Badges, has the incorrect motto.
Many thanks to Alan Benn for providing the replacement crest with the correct motto. A full size version has been forwarded to BJ. It appears that Stopfords book has caused much confusion, not least with the firm who made the gold wire blazer badge of the Eagle crest and motto.