Also, if the Chinese Yuan, became extremely valuable, compared to the UK's £.
The Chinese would probably buy stuff from the UK like crazy, because so much of our stuff for sale, would appear to be so very cheap to them.
So we would be able to start all sorts of new business's, expand existing businesses and get a huge influx of Chinese tourists. Which would in time, partly resolve the currency situation.
That is the theory, but once an industry no longer exist in a country, it will take time to redevelop. Just take an HDD for example, I doubt UK or the USA can make an HDD with totally domestic parts/labor (without needing extensive time to rebuilt the infrastructure).
TV, toys, etc., are in a way optional kinds of things. National defense is not. Say the UK and China have a military conflict, would you want the UK's military to use an imported Chinese made drone to monitor the English channel for intrusion?
I don't think the world has a handle on this yet. It is an issue beyond mere dollars.
If you look through the history books, over the last 1,000 or even 20,000 years. You see that all sorts of populations/countries/regions/industries/religions/etc etc, come and go.
I would imagine, that many of them, which were big in the past, haven't even made it to the history books.
Because they were too small or the evidence/information about their existence, has long since disappeared.
So, it is not clear, if this China situation is just a blip, and the "Roman Empire", will once again triumph again, with Donaldini Trumpatteta, the smart, sane and amazingly honest,
US, "Roman Empire", leader/tweeter.
Or, as some suspect, it is the beginning of the "Fall, of the Roman Empire". History repeating itself.
If there is a big power shift, will it just be the US, or will the rest of the West, such as Europe, decline as well ?
The UK, is hopefully small enough, to somewhat quickly adapt to changing world-wide situations. So, hopefully it can cope with whatever way round, the world ends up.
It takes time to rebuild industries, but in time I hope the UK, gets there, as needed.