i would say with your area, you probably have a lot of people who either work in banking or industries that service the banking industry - that's prime area for commuters into the city.
5 years ago or so is when redundancies were happening in those industries, we make a lot of our money as a firm from banks, we did a round of redundancies in early 2009. that was the year DH didn't get a bonus and a lot of people didn't either even though under normal years, their same performance would get them a large bonus.
we moved in 2009 (Kent, good London commute), and I know our sellers made a loss but needed to move (divorce). Since then, prices have bounced back quite a bit.
It could be the people you are 'competing' with for the houses are people who are those who've weathered the redundancies in their industries, so aren't feeling the pinch now, whereas if you'd been looking in 2009/10, you might have found a relative bargain as that's when your area really was badly hit.
There's a lot of recruitment going on in the city again. There's a lot of confidence that those who've held on to their jobs are 'safe' from the economic storms. If you are looking at houses in the £750k range with an easy commute to London, you are looking at houses being sold by/to the sort of customers banks want; people who probably have large deposits, with secure highly paying jobs - in industries where they can easily move to another job should something go wrong with this one. It's everyone else who are screwed, I think we might see bigger gaps between types of houses/areas than we used to.