Why does Britain need a plan before withdrawing from the EU? Just leave!
Britain needs a plan for
1. How it will deal with the fact that it made a promise in the 90s to keep the Irish border open yet it wants a hard border with the EU
2. How it will keep its just in time cross Europe supply chain open. How its services industry, which account for 80% of exports and mainly to the EU, how it will function.
3. How it will work with WTO rules abruptly clamping down on trade
4. What to do with millions of UK subjects in the EU and EU countries citizens in the UK