Yuppies that are not local to the area driving up the prices for housing. EDIT: They mention that they are not driving up sales prices; apart from the exorbitant buy/rent prices on their site, they are also building a new gated (yes, gated) community in Walthamstow, with houses starting from £1 million, and the design completely incongruent to its surroundings. There has hitherto not been any sort of development of this scale and cost in Walthamstow, and this estate agent is spearheading the increase of housing in the borough