How do I get in touch with this chaap, my man?

Having recently been dismissed from work I wish to complain about the poor job my union did of representing me. Throughout the entire disciplinary process they gave me poor advice and balked at asking relevant questions on my behalf. I feel the outcome ie. my dismissal was affected by my representation and I wish to take this matter further. Problem is I am not sure who to complain to. Does anyone have any advice they could pass on please? Should I complain to the union itself or is this something the TUC would deal with or another body altogether. Any advice would be greatly appreciated.

On Tuedsay I have a hearing for two charges of gross misconduct, both for bringing my compay's reputation into disrepute. My company are funding me through a degree and I was at seminar in London recently and two lecturers have put in reports against me saying that I made frequent interuptions and spoiled the lecture for everyone. To my mind I asked a few relevant questions, I gave someone a round of applause for a promotion, I disagreed with one speaker and I made a couple of humerous remarks. The second charge relates to my journey home from London. Myself and a fellow student were having a few drinks and a lot of laughs when an off duty transport policeman showed us his ID and said we'd used bad language. We both quitened down and then my companion approached the policeman and told him we were railway managers and said he shouldn't be using his police ID when he was off duty and had been drinking. The next thing we knew the policeman had called his mates at Newcastle and we were thrown off the train. The two men travelling and drinking with the policman have submitted reports totally exaggerating my behaviour - saying I was using the foulest language throughout the entire journey. I have denied this. A report submitted by a member of the train staff supports my claim but this is being disregarded as he was not in the carriage the whole time. Does anyone have any advice? Even if all the allegations were true I still don't see how I could have damaged the company's reputation so much that they are going to fire me, but my union rep says they are after summary dismissal. I have been with the company for 18 years and there are no issues regarding the performance of myu job. Any help provided willl be extremely welcome.