Heres something to help you dave,listen carefully so theres no mistakes,sheds-with-beds or slough-sheds as they were first called are mainly in west-London,got that?West London,as they are predominantly an indian/Pakistani thing,first came to prominence in slough,which is a spit from west London,so north London,east London,south London isn't known for shed-dwellers,so if illegal immigrants are USUALLY crammed in sheds,by your logic does that mean most illegals live in west London?
http://www.dailymail.co.uk/news/article-2381451/Slough-spy-plane-detects-6-000-illegal-beds-sheds-thermal-imaging