I think people are underestimating the impact of the ELL. HOP is now perfect for people working in the City and Canary Wharf. It has always been good (London Bridge is handy) but the route to Shoreditch High Street and the north of the City + the easy access to Canary Wharf means that a lot of quite well paid people are seriously looking at the area. I know a significant number of people who are looking to move out of places like Clapham into the area as they want to trade up from a flat to a house and they cannot afford the £700k+ for a family home in Clapham or North London. Rightly or wrongly, the competition for houses only pushes prices in one direction.