I've not been trying to convince anybody.
My original post was something of an aside that any prolonged period of a low £ would at least be somewhat beneficial to our Balance of Payments.
What's followed has been an explanation of this idea.
That's fair enough, it looks like you're searching for a silver lining but in my assessment, this certainly isn't one, regardless of how you've worded your explanation.
The silver lining will most likely be seen much further down the line, if the process of leaving is handled competently. In fact, it won't be a silver lining, it'll be a silver cloud.

I see what you did there, clever.