The words of a bitter man with no inheritance perhaps? Sounds like it.
For some people wealth is proportional to hard work, people who started their own businesses and worked to the bone to make it work and generate income from a successful business model. That is not luck or anything like it, it's hard work.
£550,000 is not an ENORMOUS sum of money by today's standards. It's a fair old amount, but that's what, 20 years of an average wage. What has other people's kids got to do with anything? You somehow think it's unfair that some people will inherit more than others? That is the way the world works.
Again, I have to re-iterate because I cannot believe you even said it. What has other people's kids got to do with anything? Myself and my sibling stand to inherit a fair damn amount, I don't care to inherit it, really want to think about the circumstances under which that is going to happen but I tell you something for nothing - as little as damn possible will be taxed.
Wanting to live in a fair society is a reasonable desire, and recognising that the people who profit from our current society aren't always the most deserving is totally reasonable.
Most people who are successful owe it to fortuitous circumstances or a lucky draw in the gene pool; hard work is a distant third place. There are more people who slog their guts out for a pittance than who work hard and actually become wealthy.
Just a reminder: the median household income before tax in the UK is £20,801. If you can afford to leave your kids £700,000 (or about 43 years of the entire income of someone on the median wage), you're rich compared to the rest of the population, much as you'd like to consider yourself in middle England. Hell, if you earn £45,000 then you're in the richest 10% of the entire country; if that's not rich, then what is?
People who have been lucky enough to be successful in life have a duty to help those who haven't: it's not a very difficult or disagreeable thing, and I would hope that it's human nature to want to help those less fortunate than yourselves. Pretty depressing that people are arguing the opposite on Christmas Day, of all days!