Whilst I have huge empathy for many retired home owners in this situation, the one cited in the telegraph is risible - both he and wife had money to invest (inheritance I am assuming) so likely had a 10k mortgage that he claims to have paid off over 30 years. So 25years ago, they were mortgage free, paying back a tiny mortgage by1980s and 90’s standards. They were not impacted by the property slump/negative equity saga that decimated some of my older friends in the 1990s because any secured debt they would have had for the extensions they mention and the ground floor ensuite for him would also have been minimal.
He is 91, the tax comes in in 2 years time. He’ll have the liability for a few years before (sorry to be callous) he likely dies anyway. He does NOT have to downsize or leave his home of 60+ years. Neither does his wife who may also be in her late 80s. The max of £25k that will accrue on his property while he and his wife finish their days is eminently recoupable from the estate when the property is sold. This is all tabloid level hysteria.
As a person likely to be hit by this eventually (main property is just under the threshold atm), I am completely relaxed about this. It is a peanut level tax compare to the others being proposed and discussed. We don’t really mind paying more taxes at all - but we have an issue with the mis-spending of the taxes we pay on: DEI; of newly arrived immigrants who have never paid into our system being prioritised for housing and school places over local, British and LT resident non British workers, of SEND provision being so poor that quality support and care is not universally available - only really to people like ourselves who have been able to buy that care - that we cannot afford to pay teachers, nurses, and other essential professional workers a wage that is on a par with other countries thereby protecting the quality of our health service and education for all users, adn the most vulnerable especially. I also have an issue with the fact that we will be required to run down our savings and sell our home - depriving our children of financial security and a solid safe start in life - to pay for old age care because we have financially planned, saved for our old age and for our children’s futures - when others either couldn’t or chose not to even try.
So in answer to the OP - I actually think it’s fine to pay the mansion tax, provided it goes into local services and not to central government. I also think it’s fine to pay a premium on council tax on second properties. I truly do. But I think the lack of recognition of ALL the other taxes when we rarely access the services they fund (schools the NHS, etc), and the additional VAT we also pay on other goods and services that stimulate the local economy, is a bit galling. We personally won’t be leaving the UK - we are proudly British [I was a child immigrant, btw, and am naturalised]; believe in civic responsibility and the importance of those who are able to afford it contributing to a fairer, kinder and safer society for our vulnerable members. But you cannot keep hammering people like us whilst not also trying to get people off benefits and into work, whilst not investing in education to support that, or having a policy on immigration that allows recent immigrants full access to the same socially funded entitlements as our citizens without ever having paid in… and then deride, denigrate and generally vilify us.