Thanks for that, I was thinking it was a user invoked error message as I couldnt find an article on it after a Google.

One for some reading up on I think, found this on how it works but nothing yet relating to the error

http://blogs.msdn.com/b/psssql/archive/2009/01/28/hot-it-works-sql-server-superlatch-ing-sub-latches.aspx