The only thing that I would add to post #2 is that the lease must allow the freeholder to recharge their "managing" costs. Leases often only allow the fees of an agent, and therefore you may have to appoint one and leave the time and effort to them, or set up your own company to deal with these issues on your block. That is not so onerous as it may seem, and can be covered in a separate thread.
There are several texts available however there is only one that is up to date ish, and rapidly become dated.
You can pick our brains such as they are...!
Based on the information posted, I offer my thoughts.Any action you then take is your liability. While commending individual effort, there is no substitute for a thorough review of documents and facts by paid for professional advisers. More ramblings atleaseholdpropertymanager.blogspot.com