I may have advertently misled some of those who answered my original query. Not being used to metric measurements I may have given the wrong impression of th size of the flowers. In English thses should read length approx 1" width 2/5" and circumfrance 4/5".

I think it is almost cirtainly a Datura as most people have suggested but exactly what.

I have resent the photos for easy reference

Many thanks for all your assistance in trying to identify this plant.