404 on single posts after moving single site into multisite

Hi guys

I recently began moving some client's sites from there existing single WP installs into my multisite to reduce the amount of admin for myself and I have just noticed that one I did today is giving a 404 on single posts and categories too..Pages are fine

I have tried changing/flushing the permalinks from inside the "edit site" settings (network admin) but no joy.

The site is: http://frothimoon.co.uk/

Any help would be massively appreciated!
Thanks
Martin