I do not see why anyone should be confused or have anything to complain about from the notice that says 'some' of the trains stop on request when in fact 'all' trains that are scheduled stop on request.
Fuss about nothing.
Not quite sure I agree with your Comment. I think both "some" and "all" are both potentialy confusing in this situation.
"Some" is probaly worse, as it immediately raises the question "which" trains stop by request.
"All" I would take to mean all trains passing through the station, which I understand is not teh case at Perranwell.
This is a classic case of where you need to apply Kipling's poem.
I keep six honest serving-men
(They taught me all I knew);
Their names are What and Why and When
And How and Where and Who.
If you provide answers to all of these acurately then you've probably given teh best inforamtion possible.
The interesting one to answer is "why" eg Why is it a request stop.
Does anyone know the percentage of potential trains that could stop, don't stop due to no potential joiners or leavers? If it's greater than 50% (possibly 60%) then why is it a request stop?