So when you say 'take BACC advice', read take BACC 'accept mywayorthehighway' offer, smells slightly of bully boy tactics.
Absolutely. The posts from BA pilots make sorry reading.
Don't be brow-beaten into forgoing what is due to you under the law. And respect to the BMICC for having the courage to seek this. Unfortunately, BALPA will not help you, so you will have to get a pot of money together if it comes to tribunals/high court.