What makes you think that, John?
What's the solution for high-speed security cooperation if existing agreements have to be renegotiated?
If Ireland and Scotland choose to remain, what practical measures will that entail? Not just for security, but also for commuters and businesses?
The EU is a toothless entity Carana, it has never managed to end any conflicts, that is usually down to the US/UK alliance. Look at the Crimea recently and its pathetic posturing, how many more regions will Russia simple walk into and adopt?
The UK has never needed the EU to protect us, in fact it is the EU itself which is the danger. We are very capable of maintaining alliances with each and every country in the EU without that organisation deciding tactics for us.
As for Scotland and N Ireland, the majority of the population did not vote to remain which speaks for itself. Scotland is currently enjoying a bit of a Nationalist revival but 1.5m hardly equates to much in a population of 6 million. As for N Ireland, the remainers were mostly Nationalist and Republican voters who saw BrExit as something negative in an all Ireland context so no change there then.