Well I had goo fiddle under the bonnet, and after a lot of research I have decided to drop Kempton, Southwell and Dundalk. I didn't find any reason though as to why the sudden change, it has been working for years. Southwell does have a new track that was put down about a year ago though. I have also made a small change to the Johnston system, and replaced the Mahmood system. I will email details of the new updated ebook to owners later tonight.