https://www.uktradeinfo.com/Statistics/OverseasTradeStatistics/Pages/OTS.aspx
https://www.uktradeinfo.com/Statistics/OverseasTradeStatistics/PublishingImages/Feb16_chart.gif
I would suggest some look at the above and consider:
Approximately 40%+ of UK exports are to the EU.
Approximately 10% of EU exports are to the UK.
Suggesting that we are more economically dependent on the EU than the EU is on the UK.
I am sure, that the 10% can be obtained from other than the UK.
Also consider the route for a lot of the exports to the EU and further is via Dunkirk, Calais, Rotterdam, etc., or Eurotunnel and across France, Netherland, Belgium and rest of Europe.
(Negotiate, the paperwork the licences etc.. with the various authorities less than interested in the UK. Consider the holdups at borders and consider the costs. UK costs. Why the hell should remaining EU countries bear the costs?.)
But of course, if we have problems abroad we can always send our remaining gunboat to settle problems or conflicts and call upon the EU to come to our aid, especially as we will have rejected them and the organisation.
Again, it is interesting that more countries wish to become members of the EU than leave. Other than a small pack of loonies the majority of the EU countries wish to remain in the EU. Change the rules, negotiate, why not? Destroy the institutions, NO.
But, Little Englanders behaving like wayward adolescents, always demanding to be in charge and have they have their “rights” satisfied, forget that they represent approximately 10% of the population of the EU.
The Brexiters are behaving like spoilt little children, who have had their toys taken of them and taking their bat and balls home unless everybody plays by their rules.
The majority of EU institutions, universities, research agency, intellectual data agencies, businesses etc. are already cooperating.
It is time to grow up and accept that the UK is part of Europe and the rest of the world and has a responsibility to undertake.