Thanks for the link, but unfortunately that page just looks like a web version of the link in my original post - doesn't actually answer the questions I have.
adzA, I have marked up my own copy of that document with my own notes from reading the referenced regs etc to see what actually applies to myself.
I am aware of FOIs using ramp checks as an education process so if you do reasonable stuff (perhaps just like you were taught?) then you should survive it. On the other hand, I heard a rumour here about some-one getting a hefty fine for not having a spare pair of specs with him at a ramp check?