This is very much a long term, self-interest thing. Britain (just like any other developed country) heavily depends on immigration to not fall into Japanese-style deflation, since nobody wants to have kids any more. Hong-Kongers will probably make for some really good immigrants.
That's what good business is like: win-win. The only downside is the possible retaliation by the CCP. And let's see if they actually let people leave HK en masse, or will they just lock all exits. And let's see how many people will actually want to go, even if you open all the doors for them. Whoever really wanted to leave has probably left quite a while ago.
Having a new source of immigration when you have just screwed yourself over in attracting European immigrantes due to Brexit is common sense rather than altruism.
Immigration is not actually something you need to have.
It's something the UK needs to have. We don't have enough qualified doctors, nurses, AHPs, civil engineers, mechanical engineers, electrical engineers, electronic engineers, (any engineers), architects, etc etc etc.
In the absence of immigration, assuming the void you describe were perceived, I would expect the UK to accelerate the qualification process for doctors, engineers, nurses, AHPs, engineers, architects, etc., without much affecting the quality of the doctoring / nursing / engineering that got done.
This is, for example, how people were trained to understand spoken Japanese when that became important in World War II. The first attempt involved approaching universities with Japanese programs, who all solemnly declared that learning to understand Japanese was a deliberate process involving multiple years of study. The second attempt involved a course developed for the purpose, not by the universities, that turned out functioning translators in six months.
In England "registered nurse" is a protected title. The requirements for being a registered nurse have changed over time. You used to be able to qualify then register, or work then register without getting the qualification. So we have a natural experiment with older nurses in England. Some are qualified and registered, some are unqualified and registered. We see from research that the qualification helps with patient safety.
I hope you can see that there are significant differences between learning a language and treating patients.
As described, you see from research that nurses with the qualification are better than nurses in the same cohort without. This is confounded all kinds of different ways; it doesn't come close to establishing that the qualification helped.
(The most obvious confound, though -- say, do nurses with a bachelor's degree outperform nurses with "some college"? -- does tend to suggest that, in the absence of immigration, overall quality levels will go down if the average quality of immigrants is higher than the average quality of natives.)
> I hope you can see that there are significant differences between learning a language and treating patients.
Of course, but I don't see that those differences are relevant here.
I feel like Indians already benefit from this which is why they seem to be making very effective managers.
I don't know where you are getting your information that the population of Japan is still growing. Japan's population is already declining.
http://www.stat.go.jp/english/data/handbook/pdf/2017all.pdf "Statistical Handbook of Japan" Table 2.2
https://www.populationpyramid.net/japan/2020/ ( https://www.populationpyramid.net/sources )
https://www.worldometers.info/demographics/japan-demographic...
https://qz.com/1295721/the-japanese-population-is-shrinking-...
https://www.nippon.com/en/japan-data/h00705/ "Japan’s Population Falls for Ninth Straight Year"
https://www.ft.com/content/29d594fa-5cf2-11e9-9dde-7aedca0a0... "Japan’s population decline accelerates despite record immigration"
Even your link confirms that the population is in decline, just not as quicky as some reporters say.
"While the fertility rate declined from 4.32 in 1949 to a low of 1.26 in 2005, the total population was increasing >>until 2011<< "
"Japan’s Population Decline Not as Rapid as Media Portrays".
I just noticed I could replace 2017 with 2019 in the official statistics link and did so, resulting in http://www.stat.go.jp/english/data/handbook/pdf/2019all.pdf
It is the same Table 2.2 That still shows a decline and projected decline.
I am not seeing anything that backs up your assertion that
> birthrate of Japan is considered low, but they are growing still
If you still want to assert this as fact then you are going to have to provide a reason that the Japanese government's own statistics and projections over at least the last 5 or so years are incorrect and what should be used as authoritative data instead.
Not to worry, they'll still have a chance to turn it into Windrush Generation later on.