Parked cars block main entrance of residential building

[west55]

I live in a flat of a building that has 14 flats.  The building is the result of the conversion of two combined terraced houses, where one of the terrace entrances provides access to 11 flats (see entrance in middle of photo).  The service road in front of the terraces is private, and each terrace houses owns the section of the road in front of it.  Thus, parking partially on the (private) pavement cannot be subject to any Council regulations.  We recently purchased the freehold of the building.  Sometimes, the cars (which have car permits from the building) are parked so close to the entrance of the building that it is difficult to enter or exit the building (e.g. see gray car in photo).  Personally, I would rather not have any cars parked outside the entrance.  Do I have any reasonable ground to argue that based on fire safety regulations the space outside the entrance must be unobstructed? 

[AnthonyB]

It would probably be looked at as a civil matter for the private landowner to enforce through parking charge notices and physical means to stop obstruction such as steel or concrete bollards on the pavement