I am the director covering South wales. Most of the btlers remortgage there own house to raise a deposits. They borrow 85% on a interest only loan. Some use unsecured loans to get there 15% and i know of 2 cases of people using credit cards. These were builders who refurbished the property and remortgaged very quickly at a higher value. The people being repossessed with the 18 properties have remortgaged and remortgaged to grow there empire but now prices are falling there is no more easy money, they are crap at being landlords so they will go under,(no tears please) . The mortgage companies get around the rent figures by taking a veiw on the whole portfolio not each property. At present they are desperate to lend to any one. We always try to sell our properties as the tenant moves in so we are not really involved in long term letting, but 8-10 tenants to 1 house sounds a nightmare .Good yeilds can be had in poorer areas with family tenants but you have to look hard , know your trading area and be very persistant my strike rate is for every 100 veiwings i may get 4 houses at best.