New and newish Bangor preprints.

Dear all, Some of you may be interested in some recent preprints from us at bangor http://www.informatics.bangor.ac.uk/public/mathematics/research/preprints/05... HEALTH WARNING As usual these are still drafts so may change. They even might contain errors! I will put some of them on the Arxiv later on when I have a bit of time. Tim