II don't think he will do anything about it, but he's going to end up stuffed because he will only get statutory minimum redundancy pay.
As a director he must have a pretty poor contract if he is only entitled to statutory redundancy. It is complicated as it depends on how he employed as a director, is he a director shareholder, director employee, director office holder and so on...if he is a director as employee then he has to be treated as an employee and therefore the selection process must be fair and is the easiest way to remove a director....as an office holder there must be a procedure set out in the companies articles of association and these must be followed, including a vote by all the shareholders to remove.
Either way CAB isn't really the best place to get advice..contact ACAS and get specialist legal advice.