I've always just grabbed a copy of LASORS and shown them how to find the relevant section.
That also hopefully gives them a hint to read the book rather than automatically asking someone else who may or may not give them up to date information.
Owing to a small medical issue I'm out of the instructing game whilst the Doc's do their work, but I'm very happy to note that the standards at the clubs I was involved in have continued to stay high and to even get better.
enq, it would be very interesting to see a legal case where someone refused to sign off a flight where someone was quite blatantly below par. I have a feeling that commonsense would prevail, especially as the legislation is so open to interpretation.