How about charging them? IE family comes in to flying club - "I want you to teach my 14 year old son to fly". "That's fine Mr Smith. In accordance with CAA guidance and the Safeguarding of Vulnerable Persons Act 2006 you will have to pay for the Instructor/Examiner to undergo a CRB check. If your not willing to pay come back when he is 18".
Let's stop paying for everything as Professional Pilot's.