Posted: 06/06/2012 at 08:58
Thanks to all of you for your help - what a wealth of knowledge! I have got some type 1 clematis growing alongside the type 3s, so I am getting some earlier flowers as well, but can't remember what variety of type 3s I've got. I think some judicious radical pruning of the type 3s is in order, leaving a few longer stems to cover the trellis.
Again, many thanks to all of you, and I hope I can return the favour some day!