This shows a gross misunderstanding of the tax system.
The price of an estate on death is usually vastly more than when the house was first bought. The value, due to inflation, gained over a long period was tax-free. So the majority of the estate is actually taxed only once, upon death, when the person no longer has need of it. Also, it is only about 7% of the population who have the capital to be affected by inheritance tax.
(Some content paraphrased from http://www.taxresearch.org.uk/Blog/2006/07/31/lets-be-clear-inheritance-tax-is-not-doube-taxation/ .)
