#22
Another perspective

Also think about these 10 points before going, as from a HK returnee.(still working, but close to retirement, maybe the reason of returning) 3 out of 4 kids are studying in UK.(education only, doesn't imply staying there forever, as queried by others) Of course, some HKgers would go , whatever it takes. However, still need to know better details by Jan. inclusive of any welfare, renting house etc.
Heavy taxation can cause depression, too , not simply weather/sunshine.(lack of active vitamin D, can take D3 supplement)

#14 Don't think so even staying more than 180 days would require taxation on Worldwide earning basis. The British are not so stupid to offer free stay for nothing. In return, minimal welfare, free secondary school.

So, kind of chick rib, leave only when it's a matter of life and death. Foreseeable high unemployment rate due to pandemic. There are pros and cons, no need to be so grateful at such early stage. If you sell the house after application (very likely), the asset can be taxed. Other document endorsement fees are not low, in terms of tens of thousands each, sounds like grabbing money. But no need to renew BNO.

Watch this first to grasp some ideas before going for something sophisticated.