Hi Steve, Thanks for that. Well, your technique up to the network is exactly the same as mine so I'm glad I was on the right track. I didn't think to add extra lines to help the network though, that's a great idea. Also, I had no idea there was a Merge command either, so all my joined curves refused to blend nicely like yours do.
Cool, this thread has turned into a bit of a monster but I've learned a lot!

Roger