Thanks to you all for the input, I think I have found what I was looking for after a bit more hunting around the forums. This appears to be the answer to my question posted by Wolfman
I appreciate that the desktop may have to be messed around a bit due to the change to GTK but I can live with that.
My primary aim is to just move to 18.04 and keep my home folder intact as I do not want to spend hours reinstalling stuff.