You think you own your property but actually you fell for the new build property scandal whereby you bought a leasehold for 999 years, and will be screwed numerous times by various people. You got a leechhold.
I bought a Persimmons house.
No mate, you rent the land and they get the right to charge you hundreds of pounds for just asking to think about adding a conservatory. You got a leechhold. They will.sell the free hold on and butt fuck you with covenants and ground rents. Bad luck.