For those of you interested in public art, go to the link below for a set of downloadable guidelines and policies. You may find it useful as if and when any of you get involved in this type of work (and it is a growing area) you will have to be aware of any policy documents associated with the agency/s you would be working with.
http://www.publicartonline.org.uk/resources/practicaladvice/policiesguidance/policies_outside_uk/landcom.php