Royal Oak Salt and Pepper Tray

Many thanks to ynotbrich for the photos

This is an intriguing piece as it appears to be made of porcelain or bone china.
I know that Royal Oak didn't make porcelain or bone china pottery, so perhaps they purchased the blanks and decorated them? Not sure really.
The tray is 225mm or 8 1/2" long and doesn't have the salt and pepper shakers.

I am wondering if this has been decorated with gold lustre, which isn't in the style of Royal Oak? I will check with ynotbrich.

This is most interesting. It doesn't ring any bells with me.
It is POSSIBLE that this dish is a one-off or part of a small run from Owen Salisbury's workshop. In his later years Owen did quite a lot of experimenting, testing new glazes etc quietly in his workshop off one side of the factory.
(Note that Edward Salisbury once told me that when he was clearing out Owen's workshop after he died, he stamped some of Owen's work posthumously. I have a couple of things that Edward gave me that are stamped in this way.)
ValM

This has been confirmed by ynotbrich as having gold lustre around the edges.