Right, I have been doing a bit more reading on this subject and have an opinion.
The Tribunal system has changed recently, in the old days the tribunal used to decide if your employer was unfair in sacking you due to the facts of the case against you (IE the tribunal would try to take the place of your employer in looking at the evidence and compare the decision they would arrive at to the decision your employer arrived at), now it seems the tribunal is not too bothered if you feel the evidence available to the comapny at the time of your sacking did not justify your dismissal they are more interested in the proceedure of the sacking. If you were sacked because someone alleged you did something wrong the tribunal will not focus on this as much as focus on whether your sacking was carried out after a proper investigation in line with ACAS guidelines.
The tribunal will not try to substitute itself as your employer and ask whether it was reasonable to sack you they will simply investigate whether your company followed the correct proceedure in sacking you.
I got this opinion from these two links.
http://66.102.9.132/search?q=cache:X016 ... =firefox-a
http://www.bailii.org/ew/cases/EWCA/Civ/2000/3030.html
So if you want to bring a case for tribunal it is best to concentrate on whether RM followed it's own conduct code in line with ACAS guidelines in dismissing you.
I can't see what harm it would do to bring up lack of evidence in the decision to sack you but don't rely on that fact to win.
Interesting to note the case involving the post office V Foley, the guy was sacked for going home before his duty time had finished even though his manager had said he was allowed, the decision of dismissal was upheld by the court.
The scarey thing is that it seems to give employers a lot more lee way in interpreting whether you are guilty of a charge of misconduct as this guilty verdict will not be questioned so much at the tribunal now. So IMO it gives RM the power to sack you on trumped up charges as long as they follow the correct proceedures, for instance all RM will need is for someone to put in a complaint about you, so be careful out there.
No I'm not being paranoid, they really are out to get me.