Try under Aristea ecklonii. They like a dampish, well-fed and sunny spot. Flowers of a deep blue.

Thanks everybody, someone has now identified it for me.
It is Aristea Ecklonii, a relative of Iris & Blue-eyed grass. Thank you all very much, now I will be able to take care of it properly.
Billye

Dear Vertivert
Thank you so much, I couldn't read my own handwriting: I got the Ecklonii part right, but none of the searches had Anstea.
Anyway this is exactly what it is, Aristea, & it will be lovely with my blue-eyed grass which they say is a relative. Only this will have to be kept damp if we have a bad summer.
Thank you again, any cultivating info will be appreciated
Billye