This article from RSM broadly illustrates the actual effect of the Treasury's inheritance tax 'giveaway'.
You can leave more to your children tax free, but only if you have a big enough house!
Upsizing is now an option There are also planning opportunities in the other direction. If your current home is worth less than £1m, and you plan to leave it to a lineal descendant, you may wish to consider upgrading to a more valuable house, or adding an extension or improvements to increase your home’s value. If the monies you use are currently IHT chargeable assets, you could save up to 40 per cent IHT on the increase in value of the house.