This law was designed to ensure that a certificate be issued to a landlord and leaseholder making clear to each leaseholder, their responsibility in terms of remedial works, and what they are protected from paying for.
This is a complicated set of laws and every building is different.
We think it would be foolish to try and discuss this matter at length here, but we will say that if you own a leasehold property, you must establish whether you qualify for the leaseholder deed of certificate by following this link, then provide the certificate to your landlord to allow them to determine your qualifying status, calculate your remediation cap, and many other things.
You will find plenty of resources online that will assist you with understanding your rights and responsibilities.
We hope this has helped to point you in the right direction, and alleviate a little stress on this matter.
A1 Property Management