Dear Jack,
Most helpful. I shall chase some of these references. I shall try to get a German friend to seek the regimental history.
I can be sure Aylmer did not receive the Maria Theresa or any other famous distinctions. In the family tradition his achievements seem to be exaggerated enough, for example claiming an Austrian rank higher than he achieved, that I am certain no such award would have been missed. Still, he's a very interesting fellow, Ireland in 1798, Eckmuhl in 1809, Columbia in 1820. I suspect he was similar to Flashman.
Regards and thanks again, John