I'm super curious to see how this will turn out for the UK. A lot of the comments here mention HK's relative high education, English proficiency and wealth.
If those are true: the upside will be easier settlement into the UK, maybe increased entrepreneurship. The downsides are: driving up local housing prices, increased competition for jobs.
If those are false, the UK may experience an influx of lower-wage labor and increased competition for blue-collar jobs. Possibly even increased crime (maybe Triads would move to the UK?)
I have a feeling anti-Asian/Chinese racism would spike in the UK. It has popular bipartisan support right now (another comment mentioned that) because anti-China/CCP sentiment is probably at an all-time high, but you can't take in thousands/millions of people in a short amount of time from a different culture without expecting an impact on your own.
tl;dr: How do I invest in British real estate?