Daddy, What Are Those For?

An impressive array of traditional telephone boxes outside Blackpool's main post office yesterday. Every one was equipped with a 'phone (I checked) but whether or not they were working I can't say. (I'm not sure I can remember how to use one!). I wonder how long sights like this will still be around?
Of course, they may have a preservation order on them, in which case future generations will scratch their heads and wonder what on earth they could be for.