starman wrote:

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.

That must have been a LONG time ago. I've been listening to the BBC
World Service for more than 30-years and I never heard the 'V' signal.

It was certainly in use in the 80's for certain broadcasts, and may be in use
yet today according to another poster.