Leavers had high hopes for Brexit. They have not been delivered | Anand Menon & Paula Surridge

Five years on from the referendum, few voters have seen the benefits of leaving the EU. What if they become impatient?

Doesn't time fly? Five years ago we were going to the ballot box to cast our votes in the EU referendum. Now we are approaching 18 months since the UK ceased to be a member state. The transition period ended six months ago, yet, as the latest Ipsos Mori survey indicates, most of the British public still don't think Brexit is over.

Overall, more than two in five think there are still many important issues to finalise" and lots more negotiations" to come, with a further one in four saying there are still some important areas left to decide". Even among leave voters, only one in five think the future relationship is mostly decided and will hardly change". They have a point. The full implications of the decision to leave the European Union have yet to be felt.