Just a quick update from me after the very helpful posts provided by various people on this thread.
Thanks to your help I have made contact with a very helpful person in Koln who has already provided me with more information. Unfortunately not the photo I hoping to get but a great deal of of information which will prove valuable in further researches. When the complete story had been unravelled I will maybe post it here for all to see.
Thanks to all who have helped.
QP