Ok, I'm game for this tweak.
So they buy a painting for £15,000. It hangs in their council flat. It is now worth £2m.
That painting, when sold, will be subject to CGT of £475,680.
The asset itself will then be subject to IHT upon death.
In contrast, there is no CGT on the house - only a proposed mansion tax of £2500-7500 a year.
Then the asset itself, like the painting, is also subject to IHT upon death.
Taxwise, I'd definitely rather have the house than the painting.
It's baffling how home owners are claiming to be penalised when they are in such a protected category!