Hi Just to let you know i used the above plugin and it worked on some posts but it couldn't help with the structure like /aga-cookers/aga-intelligent-management-system where aga cookers is the parent post type of the other that would be an extremely useful addition.
But i have got it working by combining the plugin above to flush all rules and the custom permalinks plugin its a strange one cos if i disable the plugin you have suggested then i cannot do url's like the above and if i disable the custom permalink plugin i cannot add slashes into the url but together they seem to work don't know if this is a good idea but it seems to be working.
Regards Chris