Japan is pretty vulnerable at the moment, but not in remotely the same way as the UK. I reckon the chances of a long-term deflationary period in the UK are pretty remote (and along with it a period of low interest rates). Not that it's impossible, I just thing it's being boosted in some quarters to justify QE/stimulus to a level not commesurate with its actual probability.
Generally when bankers get in beforehand with unpopular shit like this they are usually pretty serious about the event actually taking place. In strictly economic terms (i.e. if you have no soul) he's probably right, that special measures to prevent mortgage defaults might well be counterproductive. If you don't do that though, you have to finally deal with the absurdities of the housing 'market', and there's no more political will to do that atm than there ever was.
Generally when bankers get in beforehand with unpopular shit like this they are usually pretty serious about the event actually taking place. In strictly economic terms (i.e. if you have no soul) he's probably right, that special measures to prevent mortgage defaults might well be counterproductive. If you don't do that though, you have to finally deal with the absurdities of the housing 'market', and there's no more political will to do that atm than there ever was.