Southwark over the past few years has had a bed bug infestation. I had to deal with this many times during my working career. Sometimes due to some of the rented accommodation not providing new mattresses to subsequent tenants. However, once they are in a property (Beds, furniture, carpets etc) they are very difficult to get rid of professionally and sometimes requiring more than one treatment. There was a instant several years ago where someone moved into sheltered accommodation with furniture which had infestation and the whole sheltered housing unit had to be closed and fumigated over a number of months.