If you do not know the difference then you should probably not be allowed anywhere near a mortgage.
About six million of us live in leasehold properties, I am one, and it is a process that has been going on for centuries. It is not new and the rules are there for everyone to see.
Now we learn that "thousands" of people are "surprised" to learn that they do not "own" their properties or that the freeholder (of the land on which the properties are built) and who allowed the issue if leases can sell that land and the leases to a third party who can also do the same.
Maybe before handing over their £X00k for their perfect des-res they should have done some research, and, maybe, they should also have asked their legal representatives to explain things to them in great detail.
They would have had the paperwork for them to inspect, so they were not scammed, misled or mis-sold their properties, as they now claim, they were just naïve.