The Liberal Democrat leader, Ed Davey, has said his party would not seek for Britain to rejoin the European Union in the next parliament, calling it a "long-term" objective because the Conservatives had "done so much damage". Speaking at the party"s manifesto launch, Davey said he wanted to see the UK back at the "heart of Europe" Lib Dems to promise overhaul of capital gains tax to raise £5bn for NHS UK general election live – latest updates