I see Jackson & Perkins is reintroducing 'La Di Da' this season, which prompted me to look at your entry for this rose, since I'm one of Tom Carruth's minions at the Huntington Library's Rose Garden. He was quite surprised at its re-entry into the market. Anyway, I notice the HMF entry on this rose asks that we contact you if anything more is known about the parentage. I asked Tom about it and he says it's 'Wild Blue Yonder' x unnamed seedling from Colin Pearce in the UK.

Hope that helps!