This is a production database, the errors appear in the SQL Server Agent log only and not in the normal Sql Sever log so naturally when I stop the Agent the the problem no longer appears in the log as the Agent is not logging anything.

This has been a really tricky one, I have tried to replicate it on the staging/test server but there it works fine, no errors. On the productions server I have stopped every process I can think of other that stopping the SQL Server and monitored the log but they still appear :unsure: