Very generally speaking, some of these very wealthy people are not just using their wealth to benefit their families, they are part of the problem affecting the home owning aspirations of the relatively poor. They are "raking it in" through their high rent charges, sometimes with enormous rent empires, leaving the relatively poor no chance of putting savings away for a home owning deposit after paying other essentials.
UK housing has not had a fair supply and demand market for decades, by and large the build rate of new homes has far outstripped demand of a growing UK population, often making house prices rise faster than inflation. But the wealthy have been able to still buy homes to add to their renting empires, further reducing the number of homes available to buy, further freezing out the poor from getting a mortgage while landlords can then shaft them more with increased rents.