It is illegal and, fox control issues aside, just wrong to put down baited poison in an urban environment.... "It is illegal to poison foxes.The government?s Wildlife Incident Investigation Scheme looks into the deaths of wildlife where there is evidence that pesticide poisoning may be involved." http://www.rspca.org.uk/allaboutanimals/wildlife/inthewild/foxes ... and there are many other references on the web if you want to keep looking.