[PMoz99]

Thanks guys. I was aware of Drewes and Herget (Chris - I agree is probably 'Merget'), but the other names are gratefully received.
Andy - thanks for the effort. Trawling through those summaries was next on my agenda if I didn't get a list here. Sorry you had to go to that much trouble to help.
Adriano, thanks for the thought, but it seems German only .......... I envy you for having known Drewes, and probably others like him. I would have loved to have met them.
Peter