Sound Barrier Over London By A Lightning

[Peter Barron]

I remember either in the late 1960s or early 1970s that a Lightning made 3 passes over London breaking the sound barrier each time.
I can still remember hearing the sonic booms, I think the 3 passes were made over the course of a week.
This was the last time I heard the sound barrier broke.

Does anyone know the actual dates and why it was doing it.

Thanks.
Peter.