Unless I am missing something, it seems that they are just doing a 12 lead resting ECG. You could get this done at your GP surgery free in a matter of minutes. You GP is likely, as you have noted previously, to be extremely sceptical as to the justification and indeed the value of this (as am I), but it is cheap, quick, and he might be persuaded...
Oh. I have missed something - they do an echo as well, if indicated. I remain sceptical, given what I know of your abilities, but I'm ready, as ever, to be proven wrong.