The Candy brothers are for real, a unbelievable increase in wealth but for many years people have been able to grow their portfolio without using any of their own money. There are many thousands of people who have steadily bought property over the past 10 years and know own millions of pounds worth of property each for which they may have put in £10,000 of their own cash. There is a bloke that started to buy garages back in the 90's last time I heard about him he owned over 300,000 and was a billionaire.
You can still make a lot of money in property but there is much more at stake as you don't want the bank repossessing your house. Also the banks are not that interested in lending money to you until your atleast 21 or even 25.