Transience is one thing. The more a property changes hands and the more people move into an area the higher the prices will generally go. An area will struggle to have that transience without good transport links and until now (ELL extension) SE23 hasn't really had those links to cater for "fall out of bed onto the tube" 9 to 5 workers that will pay slightly over the odds for convenience and a lovely flat. The catch twenty two is that property developers will not spend money making these lovely flats until they see signs of that demographic moving in.