Zoopla, the UK’s second-largest property portal, has cashed in on Brits’ house envy as it pivots towards serving existing homeowners who want to snoop on the value of other people’s homes. New chief executive Paul Whitehead has pushed the property site away from an emphasis on transactions, instead hoping to woo homeowners who use the site more frequently for a range of financial services. As part of the group’s reinvention as a property valuat…