Cameron did exactly that well before the referendum and the EU, effectively told Britain to F off. This, after the EU had bankrolled Greece who were in a terrible state.
EU showed nothing but contempt for Britain, we effectively had no say in matters and I believe that was a factor for a lot of people who voted leave when the referendum was eventually held.
Some have been saying that May's husband will benefit from leaving the EU, yet May was in favour of Remain at the time of the referendum!!