It all comes down to supply and demand. Demand has increased due to the ELL, greater awareness of the area, and inflated prices in surrounding areas. Prices have naturally increased to reflect the greater competition for houses which, even at their current prices, are comparatively cheap compared with other parts of London. If anything the surveyors are pegging back the natural rise in prices under instruction from cautious lenders. If lending was like ten years ago, I'm sure prices in this area would be actually rising much faster.

I don't understand why people think it's so crazy- you can't expect prices to remain the same if the area becomes more desirable to more people.