The UK based Institute of Economic Affairs has launched a competition (with 100,000/£86,000 euro First Prize) for UK stance post 'Brexit': "A referendum has resulted in an “Out” vote and Her Majesty’s Government has triggered Article 50 of the Lisbon Treaty. What measures does the UK need to take in the following two years, domestically (within the UK), vis-a-vis the remaining EU and internationally, in order to promote a free and prosperous economy?" IEA Brexit Prize | Institute of Economic Affairs

In the 'small print' (pdf files) it contains the following guidance

A prize-winning entry is likely to cover, inter alia, the following areas:

The legal/constitutional process necessary for the UK to leave the EU and set up, if
desired, alternative international relationships. This would include not just the process
within the EU itself but the changes to UK law and regulation that would be desirable
or necessary.

Negotiation of the UK’s post-EU-exit position, to settle the UK’s relationships with the
remaining EU (however it is constituted) and – crucially – with the rest of the world, in
respect of areas such as trade, immigration, global governance, defence etc.

The economic costs and benefits of the proposed model considering the effects on
changes in trade patterns with the EU and internationally; inward investment; and the
position of the City of London.

The approach to regulation in areas such as employment, the environment, banking
and financial services and energy markets and the nature of appropriate agreements
(if any) that should be sought with the remaining EU, the EEA and/or other countries.
Since it becomes clearer that the UK will, at some point whether it be 2017 as Cameron has said or earlier, have a Referendum on continued EU membership (Cameron promises 'renegotiation' before Referendum if he wins the next election) and there is an even chance that the UK would return a 'leave' vote what then?