chrysanthemum maximum, Leucanthemum × superbum , shasta daisy
For those old enough to remember there were 2 varieties, Esta reed, a
single, and Horace reed which was a double.
I was also brought up to them being called Marguerites
Try goggling Leucanthemum × superbum
David @a roasting side of Swansea bay, 2nd day reaching 84f. in the
shade, I just wish I had been

Looks like you and others have sussed it. Now I have to find one locally.
Thanks all
--
Jim S
Tyneside UK
www.jimscott.co.uk
http://geordiecamii.wordpress.com
http://geordiecam.wordpress.com/