Remove option to create a blog all together

Hi, I'd like to completely remove the option for our members to create a blog (so no one can other than admin). I've searched, and if I understand this is in WPMU admin, and then soem work needs to be done within buddypress to remove references?

However I'm running Wordpress 3 (not MU) with buddypress, and I can't fidn the option in wordpress 3 to disable blogs?

Any guidance as to how to do this from within wordpress and or buddypress would be great thank you

http://www.accessart.org.uk/studioproject (in progress)