spyderman: i think the stress issue applies to the animal which you are feeding too.
i think the law is that you are not allowed to feed live vertabrates. (or so the guy at the zoo said) it also applies to not feeding live antelope to lions in zoos and live mice to pet owls and stuff like that, so its not only reptiles that are affected.
theres some stuff about native species laws and the dangerous animals act, but i think thats only for venomous species and crocadilians. http://www.netgoth.org.uk/~caleb/uklaw.html
it also tells you about native reptile law, and import/export also about releasing animals
hope i helped some....