If I may offer a final thought, David...
The purpose of this band and the standard it achieves are neither here nor there. There is really only one issue and that is the use of a band name that most of us, I think, would seek The Shadows' permission to use.
It is none of our business whether that was done or not. If it was, the story's over. If it wasn't, I am sure through this site that The Shadows are now aware of it and surely it is for them to decide whether they want to do something about it or not?
Iain