UK guy,this sounds like a witch hunt from what I heard.Every time you explained to her what you did they just moved on to another delivery in the hope to catch you in a lie.Although they are accusing you of signing someones name,which I believe is a complete fabrication on thier part,thier only agenda seems to be to fire you regardless if its true or not.
That was really scratchy,but from what I heard,you had no union steward in that room during the "interview".
Everyone thought your posting on youtube was a bad idea,and I saw you removed it,why is posting it in here any different?
Anyway, I think you are innocent,and I hope you're back in brown soon.