Hi Derek,
Four vessels of the same design- Example, Express, Explorer and Exploit- were built for service with the Royal Navy Auxiliary Service (RNXS). They carried the prefix 'XSV', meaning 'Auxiliary Service Vessel', and could be distinguished from the Archer Class by their black hulls. However when the Royal Navy Auxiliary Service (RNXS) was disbanded on March 31st 1994, the four craft transferred to the Royal Navy, where they serve as Sea Training Tenders from Royal Navy University Units (URNU), when they changed over to the Royal Navy the Penant numbers were changed, this model was built when she was in service with the Auxillary Service.....
The other three ships were A163- Express, A164- Explorer and A165 Example
Thanks
Russ