Devon,
United Kingdom 
I was given this plant several years ago and it's languished in my garden in the westcountry. It has increased in size dramatically and now looks as if it is about to produce one large flower. I have no idea what it is called. Does anyone recognise it?
9 May, 2015
Answers
It is one of the Phormium cookianum, possibly 'Cream Delight'
9 May, 2015
Yes, a Phormium. You might be disappointed in the flower, I was!
9 May, 2015
Botanic has it... definitely P. Cream Delight...
9 May, 2015
Thank you all for your advice - at least I now know what I'm dealing with!
10 May, 2015
Yes, it's a Phormium. The flower is like a very large gladiolus. I loved it.
10 May, 2015
Could be a Yucca flacida, varigated form ?
9 May, 2015