Hi Weeditandreap,
I love your name!* :)*
Moving clematis is risky and tricky at best.* Most sites recommend to plant a new one and forget about moving them.* I moved a Jackmanii twice before I knew better and it's never really done well.* It's been in the same place for 5 years now and is just starting to fill out.* You might want to consider taking cuttings for insurance and then attempt moving it.* I have several sites for you to refer to. Take a look here for moving a clematis.* All your transplanting questions should be answered here.
http://clematisinternational.com/growing.html#pg4
Here's how to take cuttings.
http://dialspace.dial.pipex.com/clematis/clemindx.htm
You mentioned that you have one in a container that you would like to share with a friend.* You might want to GENTLY dig down to see if it has rooted where you might be able to separate it.* If not, consider taking cuttings.
Clematis like lots of organic material in the soil so I would suggest adding lots of compost to the entire planting area.* After all, you only get the one chance to amend the soil when you plant these beauties.
Here's info on the different pruning groups.
http://dialspace.dial.pipex.com/clematis/prune.htm
For id of your plants you could use these sites.
http://www.saska.demon.co.uk/index2.html
http://www.clematis.hull.ac.uk/
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.