Funding for Lending has pushed rates down to... simply rediculous levels.
I'm about to remortgage for 5yr fixed @ 2.99%.
When you factor in yields of 5-6% (perhaps better outside London) many people will do the math and conclude there is no "reason" why they should not be buying if they can fix their costs and why the market could not easily go up another 20-25% before renting again becomes cheaper.
I know it's a precarious, strategy that is doing unrecoverable damage to the UK in the long term, and rates can only go one way, but we all know that Osborne will do everything he can to prop up the housing market, so people are rightly concluding that they are individually better off to go along with it.