[Typo3] Hiding page content after user edits

[Darren at Home]

I have got users set up as site contributors where when they create new page 
content, the new content remains hidden until an admin user has checked over 
it.
This was setup using TCAdefaults.tt_content.hidden = 1 script in the BE User 
Group.

What I also wanted to do was have any existing content that is subsequently 
edited by a site contributor also change to hidden status until an admin has 
re-checked it. Is this possible?

Thanks

Darren