RE: T. O question29 Jun 2024 08:48
Under current ISA rules the money invested in your ISA stays in your ISA and can be reinvested in any share eligible for an ISA (includes US, France, Germany, Hong Kong, Japan - not South Korea or Switzerland) . There is no restriction (currently) on the amount you can accumulate in any ISA only a maximum amount that can be invested in any tax year. Last figures I saw was that over 4000 ISA millionaires with Top 50 averaging £8.5 million.
I would expect the above to change with a change in Government with lower annual allowance and limits on total investment and/or maximum value.
If we were to remain independent but dual list on NASDAQ then Avacta shares held in an ISA would no longer qualify for exemption from IHT if held for more than two years.