I hope they win, you should never have been given a tribunal based on the information you gave.
		
		
	 
It would appear that people with more knowledge that you disagree.
Let's wait for the tribunal to go through and see what happens.  
I'm all for fairness when it comes to these things and I myself was dismissed by a company that I had worked for for over 10 years and as Group Manager with responsibility for all branches in Scotland and reporting directly to the Board of Directors.  
I was dismissed on the spot by the MD one day and had to make my own way home as I had my company car taken from me there and then.  I was told that I was not receiving my notice, commissions, holiday pay etc and escorted from the building.  My "crime" was ordering the wrong product colour on a £4000 order.  I did not even order the goods and had evidence to prove this.
I believe the company wanted to get rid of me as due to increasing performance at all the branches my gross pay actually topped that of the financial director and with a new branch opening my income would have increased dramatically due to the contract I was on.
An appeal was lodged and I met with another director two days later who upheld the MD's decision - not surprising as they are brothers.  All the other directors are non family but when I asked that I meet with one instead of them he said no.  As I left the meeting I advised them that I would see them in court to which the Sales director laughed out loud in front of my witness.
TIMELINE:
Tuesday PM: Dismissed
Thursday AM: Appeal Meeting
Thursday PM: Met with my layers who wrote a letter and had it delivered by hand.
Friday AM: Letter delivered
Saturday AM: Cheque through my door for in excess of £7000 in respect of salary, comms and holiday with a letter requesting that this be the end of the matter.
I took that as I had planned to change career anyway and took a few months off then went to Uni got degree and working in different field that I love with a company that values me.  OK not earning as much but lets face it that is not everything in life.
OP if you think the dismissal was unfair and you have the appeal all the best.