The short answer is no there isnt legal aid available.
I think it is a little early to go 'lawyered up'
Write them a letter saying you will attend and ask what the agenda for discussion is, and how long the meeting they think will be.
Go at the appointed time and take writing materials with you and keep notes even if they have a secretary.
Answer clearly, say if you don't know after all they havent given you much time to prepare answers, and at the end thank the for taking time to listen to your side of things
Do not accuse them of being part of a conspiracy.....
and good luck
Take time off to read the various Dwesktop threads
and say to yourself: I am not gonna be like that.