Lease Infringement Issues

The bathing water to our 4 flats has in the past been provided from a communal tank in the attic space of the block. Our leases clearly give us right of usage but no right of access and clearly defines the servicing of the supply to be the responsibility of the management company that was set up by the previous land lord to service the common parts, and not the landlords responsibility. In the past , although the tanks were in the attic which was the landlords demise, access was through an un locked trap door and servicing, including the installation of new feeds and returns to the tanks for two of the flats has been provided by the management company.

The landlord has now built a new penthouse flat and access to the tank area is now situated behind the locked front door to the new flat, which is now being offered for sale on a long leaae. Irrespective of what demise the tanks are now in and what clauses are put into the lease of the penthouse flat, my question is I think relatively straight forward......in the past my lease has provided that any issues regarding servicing of the supply of bathing water to the flats was an issue that was resovable between the leaseholder, the mangement company and the landlord..........Does not the insertion of a forth party into this equation infringe the terms of my lease?.

If it does infringe the terms of the lease, what steps can I take to nullify the situation.