This is not a measure aimed at individual prospective homeowners seeking a mortgage, nor is it an attempt to impose some kind of cap upon those seeking to sell their homes - rather it is a suggestion that the BoE have the power to change rules and regulations for mortgage lenders as a whole, based upon the index of house prices, with a suggestion that, say a 5% annual rise in average prices might trigger such an intervention.
"f the inflation limit was breached, Rics argues, the Bank's fledgling financial policy committee, which is in charge of safeguarding financial stability, could act.
If it believes a bubble is emerging, the FPC has the power to direct the banking regulator, the Prudential Regulation Authority, to force lenders to set aside more capital against riskier mortgages, for example, which could make high loan-to-value mortgages more expensive.
Joshua Miller, senior economist at Rics, said: "The Bank of England now has the ability to take the froth out of future housing market booms, without having to resort to interest rate increases. Capping price growth at, say, 5% is one way of doing this.""
http://www.theguardian.com/business/2013/sep/13/house-price-cap-property-bubble