Did angry Lib Dems cause Brexit?

A recent political anecdote passed most people by; it is the story told by Donald Tusk that David Cameron thought that being in a coalition with the Liberal Democrats would prevent his proposed referendum from going ahead. He was therefore able to say he would call a referendum to try to hold his Conservative party together, but was quite confident that the Lib Dems would block him when he tried to carry it out. That way he would…