Saw someone suggest a good idea: rather than a flat inheritance tax have a sliding scale of inheritance sales tax
If you inherit the property/assets/land and sell straight away you pay full whack, give it a few years a bit less, a few more a bit less etc.
Tarquin who wants to sell daddy's paddocks to fund his new extension pays IHT, but the asset-rich-cash-poor family who want to continue farming the land their family have farmed for generations end up just passing it down and continue to do so
Admit I am a bit biased though as I'm not overly keen on inheritance tax, and I grew up working summer jobs on farms so have had a taste of what life is like for small farmers