I got some rat traps the other day, just like big mouse traps and only £1.50 each. They seem to work well, this brute was over 16 inches from nose to tail.
Much as I hate having rats I'm glad its a quick death.
(http://homepage.ntlworld.com/stan.shepherd/downloads/rat.jpg)
Hope I never get a rat in MY greenhouse, all the cuttings and plants would die cos I wouldn't go in there :( Maybe I would lock my daughter in there as rats don't worry her but she wouldn't let it be killed!!
Sawfish, well done set the traps again and get rid of the dirty Ba-----s ;)