Should I take legal advice ?

Yes, you can take legal advice alongside mediation.  The presence of your solicitors at the meetings is an always an aid to reaching an agreement, they will be able to draft up a binding consent order on your behalf.  

Your lawyer will be able to give you further mediation information, such as what are assessment meetings, and what happens in the mediation sessions. He or she will be able to explain how the entire process works and how it’s a great advantage over expensive litigation costs, they may also be able to help you with legal aid