That's great Andi, trying several seedlings in different places might be the key to finding out just how far you have to be from the trunk of the tree for that type of clem.
My husband has kept saying that we need another clematis with an obelisk on the other side of the patio to balance it out, but its were Dutchess of Albany was planted last year, and died. So, I yesterday planted Mrs. Cholmondeley in that spot and will keep my fingers crossed.