DH died leaving me a young widow. There was no tax to pay on his estate becuase it largely comprised of our shared house, which passed to me outside of his estate and pension assets which were exempt.
It does however leave me with quite a high net worth (and hopefully a lifetime to use it, so there might be nothing left!)
I understand my own estate can use his inheritance tax allowance which, if it included property, essentially means up to £1m tax free, but is this indefinite? I might not die for another 50 years! Also, what happens if I remarry? No plans to, in fact quite the opposite to protect my DC's interests, but just curious.