Brexit will be a disaster for Britain.
Consider just avaiation. The impact is
enormous as markets, systems, safety frameworks, border management, security, air traffic management, and on and on are all part of EU systems. Can't use them anymore.
That's just one area. The list is practically endless, and includes the financial sector, building sector, IT sector,
food, etc. etc. etc.
It's not just signing a few pieces of paper here and there. It is
a lot of work. Insurmountable I'd say.
Not a bad, brief overview here:
www.thebalance.com/brexit-consequences-4062999