I may be a bit early/late for my visit, is that OK Nanny Alice?

NO, it is not OK for you to be late unless you let me know as asap in regard to not being able to keep to your allotted starting time. I need to know where I stand at all times.  If you are early on the other hand, walk around the block to kill time, have a coffee, and only call me when agreed. That is what I do when I am early for appointments, so I expect the same from others!