Hello, we have recently installed a new main entrance door to a B&B.  It is accessible by keypad (enter 4digit code) and also manually via key.  To exit, there is a 'Press to Exit' button, which opens the door and also you can turn the knob to open manually.  On rare occasions, some guests enter/exit and carelessly leave the door open (it is not automatically self closing).  Does my main entrance door need to be self closing by law?  Currently, on check in I explain it to them and also text them a reminder about shutting the door.

If this is the door to the outside then no, not unless by some strange chance and external escape stair passes close to/in front of it.

Thank you.  It is the main door to the outside, no stairwell in sight.  I thought this to be the case, but someone planted the seed and said it had to self close.