Well, I'm not British and I am a guy though I did help raise my nieces and nephews and that was enough kiddie stuff for me.
Quite frankly Brexit in all it's forms is just a horrible idea. If you follow Wall Street as I do then you learn that it doesn't take much to either spook or excite the stock market.
Unless somehow the U.K. manages to remain in the E.U. , I don't see how it avoids a financial and social catastrophe. We do live in a very interconnected world and if the U.K. goes down then it has the real potential to take other countries down with it.
Financial institutions can indeed be reasonably healthy and strong but if a belief gets generated that say a certain institution is not, then customers may begin to pull their money out, and other financial institutions may refuse to do business with them because of all the rumors and then that institution is really in trouble.
Then other financial institutions begin to be doubted and the same thing begins to occur with them. From what I have read that is what happened to Lehman Brothers ( though they were in a weak but survivable position with regard to sub-prime loans ) . Markets tend to be emotional and not rational.
It's not that hard for me to see that businesses begin to collapse post-brexit ( depending on it's exact nature ), taking U.K. banks and other financial institutions down with them ( because this financial crises is real and not based on rumors or speculation ) and this spreading to the rest of Europe and then meandering and affecting the U.S.
If statements from large businesses and organizations seemed to be measured and a bit tame about the potential impacts, well they have to be from a practical, strategic, and perhaps legal standpoint.
There is what they can say they think is going to happen ( a recession with a certain shrinkage of economic output ) and then what they think is really going to happen ( something really. really horrible ) which is why they are either pulling out or making plans to pull out.
I watched Theresa May in the House of Commons and there was quite a cheer when she mentioned the possibility of no Brexit at all and I had to cheer as well, though she made it sound like that would be a sad thing.
It's one thing to have to endure misery that is visited upon oneself, it's another thing to invite it.