It says
“Mumsnet has not checked the qualifications of anyone posting here. Free legal advice is available from a Citizen's Advice Bureau”
This is not strictly true and could lead to disappointment if people call Cit A for legal advice. Volunteer advisers (me!) are not necessarily and probably not legally qualified. We very clearly state to clients that we can provide a wide range of information and advice but cannot give legal advice. An important distinction. If it’s clear that the issue requires legal advice beyond that which we can give we signpost people to a local Law Centre or Clinic, suggest they use legal cover with any insurance policy they have or to the Law Society for a list of local solicitors (as you rightly say in the blurb)