Ik spreek bajia Nederlands, ik woont in Den Haag for negen jaar.
I speak a little Dutch as I lived in Den Haag for 9 years.I have already done .nl Google search and checked the bulb specialists for you in Holland, Canada, Australia, USA, UK and Germany.
I did find a couple who live in Washington, PA, who have it in their collection. I have emailed them on your behalf and am still waiting for a reply.
Hart's DayliliesI also found another place in Canada but the image didn't resemble 'Sandy Denny' in the slightest, there were also concerns to this supplier on some of the Daylily/Hemerocallis sections of plant/gardening forums.
It may pay to email Ludlow Lambertson as they maybe able to tell you of someone in the UK who they have supplied too.
I had a bit of spare time yesterday and as I had not known much about Daylilies I thought I would do a bit of searching for you. It was quite an educational one and interesting. I had no idea of the vast variations there were/are available. It also seems quite a popular and serious hobby to have, collecting and the hybridisation of Daylilies. Like you, with what you said in your first post "its not normally your thing". That said I can understand why people grow these, some of the Daylily photo's I saw are absolutely stunning and very striking. I have to admit I am tempted to have a go at growing some myself.
Edit: I also have a confession, I did not know who Sandy Denny was, obviously that was yesterday, today I know perfectly well that Sandy Denny was a talented singer/songwriter. I spent a bit of time late last night listening to her music while I searched for her Daylily.
I plan to read a bit more about Sandy Denny, from the little I did read it seems her life was a troubled and very interesting one.
Coincidently I stumbled across 4 video's of Fairport Convention Live on Ainsdale Beach nr Southport in June 1971. The violin is my faviote intrument and Dave Swarbrick plays in very well, it works very well with rock. I especially like
"The Journeyman's Grace" played in part 4 of the vids. I might just have to play it again.