Inheritance tax is very unfair. If you are rich enough, you'll plan around it and avoid it. But if you're not rich enough, your kids will not only lose their parents, they'll be sent a bill from the government. Which at best is a tad insensitive.
Add to that the fact that the thresholds for inheritance tax haven't been raised properly, so that someone with a 1 bedroom apartment in London will be subject to inheritance tax, it all seems pretty unfair, and perverse for the government to effectively profit from peoples death.