Emma - I was very tempted by the golden cow parsley but the label said it would only come true from seed if isolated and I have loads of the common cow parsley in the area I wanted to put it. Still wish I had got one to try it though as it was very attractive.
Here are a few photos I took at the RHS yesterday
1. Seedling on Avon stand
2. Lovely Lunaria called Chedglow - I hope this is soon available. This was on the Avon stand
3. Iris histrioides 'Lady Beatrix Stanley' - I intend to try this in a partial shade woodland setting with Iris Katherine Hodgkins.
4. Jacques Amand display of Iris which looked lovely