At one time the BBC used the Morse 'V' as an interval signal played on a
tonic
scale. I have not heard that for a long time.

I feel certain I've heard that at least once since I got back to listening to
SW 1-1/2 years ago. It was C-E-g-C, wasn't it? (I think I used the correct
notation. The g is below the middle C.)

Here ya go... I haven't checked them out yet, but WOW!

http://www.intervalsignals.net/countries/uk-bbcws.htm

Bill, K5BY