Removing a chimney breast

Do I need Freehold Management permission to remove a chimney breast that is not linked to any neighbours sideways? I am aware that under the Party Wall Act, as it is a block of flats, only 3 floors building, my property is in the first floor and the chimney is not connected with any other property, only the partition walls considered connected by floors. So,I therefore need to communicate and notify the neighbours above and underneath my flat. With Structural Engineers reports and plans presented and with Building Control approved to go ahead by the council, can the Freehold Management of the building deny such work to go ahead without any reasonable explanation apart from the clauses of the lease that are draconian and not affecting the structure of the building as such scare monger ideology imparting to few owners but not to all in a fair manner.