Thank you again for your replies. I don't think my narcissus is a tazetta, which are quite tender in this part of the Country and it isn't multi-headed.
I agree it is probably Div, 3, not Poeticus as I first thought.The variety , Mrs Langtry, suggested by Silversurfer, is very similar, but the cup looks too dark, mine has a very delicate lemon cup.
I think it could be an old variety though.
I'll keep looking and hoping.