So many threads like this. The fact is that the UK is moving away from a society where your income from work determines your outcomes in life and towards one where inheritance does.
If this sounds mad, well, it's exactly how society worked for most of modern history.
Think of an Austen or Dickens novel. The reason everyone was so obsessed with inheritance - great expectations and all that - is that you couldn't, except in very very rare circumstances, work your way from a lower lifestyle to a higher one. No job could realistically bridge the gap between the haves and the have nots.
The factor driving this is that house prices have become totally unmoored from earnings. This means that those who inherit property/money from the sale of property, get MASSIVE multiples of the average annual salary. The average house is now worth about 9 times average earnings. The last time that was the case was in 1876... see above!
If someone inherits a house they now inherit 9 x what they would earn in a year - on average. If you factor salaries after tax into that, it's actually a much higher number. You can't bridge that gap with hard work unless you are a very, very high earner. A low earner who inherits property will be much better off in financial terms than a high earner who doesn't.
We are at the beginning of this trajectory. In a generation or two's time the gap that is opening now will be much, much wider.