Can you identify this flag?

[Humblebee]

We saw a boat flying a triangular burgee on its crosstrees. Basically a saltire, Scottish flag, blue with a white diagonal cross, but with a fairly conspicuous crown in the centre.
Anyone know what this is?
Cheers.

 

[LONG_KEELER]

The Scots are very good at bowls and it's very popular there. They seem to have invented most modern sports

Perhaps a Crown Green bowler visiting Scotland?

 

[Stork_III]

Royal Highland Yacht club?

 

[Humblebee]

Royal Highland Yacht club?

Well spotted Stork, that's the one, thanks.

 

[savageseadog]

Aha! The British crown on it.

 

[awol]

Aha! The British crown on it.

But not Irish, Welsh or English ???????

 

[MADRIGAL]

Royal Highland Yacht club?

Was she also wearing the undefaced Blue Ensign? I believe that club has the right to issue permits for it.