Very nice! Only just discovered this thread and it reminds me of a display at Vincent Square a good time ago - presumably by one of the National Collection holders (I think at the same time that Corydalis flexuosa was first shown in several forms by Martyn Rix). This such a worthwhile garden plant despite the great tendency of many gardeners to just think of it as a weed. Would be nice to find a collection coming together again as Alan hopes. This is a dusky corner in our garden with 'Brazen Hussey' seeding all over and some marbled leaf forms. The double forms are rather more precious and slow.