“A lot of money is moving off Heathrow and on to Gatwick. Heathrow is closer to the answer, but not deliverable. Gatwick is more deliverable, but it is not the right answer.” He said, expanding Gatwick was “a sham, a snare, a delusion”. The estuary plan, dubbed “Boris Island”, would cost £25 billion to build, with a further £25 billion for transport infrastructure, and £14 billion to purchase and close Heathrow, which would be redeveloped as a new suburb.