When people say that they have earned every penny that they will leave behind, I have a certain sympathy with that, as I, along with my husband, have earned everything we own, too. Neither of us has inherited a penny, and if we do in the future it won't be a lot, as we both have two siblings and their grandchildren are included in existing wills. I understand the desire to pass on what we have worked for - it's part of the reason we did so.
However, money that is accrued simply by living in a house is not earned, and is massively variable by location. I think that this should be taxed, rather than total amounts. So if someone bought a house for £10k and it is now worth £200k there should be a formula that works out what the £10k paid at the time is worth in today's money, and the difference between that and the selling price should be taxed. Savings from income have already been taxed at source and again on the interest, so I don't think they should be taxed again on death; but unearned profit on property should, IMO be liable to tax, in order to avoid exacerbating existing geographical inequalities.