U.K. house builders could be set for a lackluster summer season, Jefferies analysts say in a note. May's mortgage approvals are down, and discussions over potential changes to the stamp duty property tax are stifling demand, Jefferies says. Moreover, until there is more information on the housing policy of the potential new prime minister, stocks in the sector might suffer, the brokerage says. Still, it's a great time for investors to buy in before the rest of the market catches on as company stocks sell at around 60% of what their real-world physical assets are worth on paper, Jefferies says. Barratt Redrow shares are up 2.1%, followed by Vistry, up 1%, and MJ Gleeson, up 0.2%. (anthony.orunagoriainoff@dowjones.com)