I personally doubt London real estate such as regular sub £2m to first time £0.5m buys are pricing in future potential market volatility given UK EU hard WTO default no deal Brexit and medium term Covid fluctuations. And this is despite the UK government always favouring fiscal monetary policies for maintenance of high residential house prices over addressing fundamentals due to house builders artificial supply limitations.
All HKers with the financial means always prefer Singapore or Taipei or even Hongcouver or Sydney over London unless just for top UK university undergraduate degrees and professional qualifications or post graduate advance research.
Mainland China is about to block the UK visa and potential UK BNO citizenship route anyway citing the usual interference in domestic affairs nonsense. China is rapidly blatantly reinterpreting the PRC UK Joint Declaration or simply ignoring the 50 year one country two systems as simply put the current China is not the old one back in 1997.
UK with Brexit will show its true colours and relative reduced strength if US does not offer any tangible support and Germany/France does not play nicely as possibly in spite of Brexit and other internal EU issues. I doubt the Anglo sphere of former colonies will be massively supportive of a non EU UK and also the Scots are happy to Scotxit to leave London, south east England along with industrial Midlands and north to keep UK (excluding Scotland) afloat.
All the above is just my guesstimate as London property prices tend to only follow one general long term upwards projection despite a few blips along the way. Make sure you spend wisely and take into account new Covid preferred requirements and local demographics as politics and suppressed historical wrongs and anger has come back as a Covid fallout. Luckily we do not in UK have select American style disfunctionality. Well not unless there is shortly mass unemployment and world record Covid fatalities. Both are possibilities given UK general public pandemic behaviour norms as distinctive with most developed nations.
Finally if US, EU and East Asian corporations still have faith in HK then there is possibly still a few good international business potential years left in HK as the regional business centre and bridge into the mainland market. Singapore may have other ideas though and look likely to capitalise on HK’s current forte.