Just got a call from the union and they've been onto the ex-boss asking for my employment records. Apparently the response from the factory was that they believe I owe them money and they are going to take me to court. So the union said 'OK, fine. We'll see you in court.'
So, long story short, the ex-boss is going to send my records to the union. I'll also provide copies of all my pay slips and they'll do a cross check and we'll see where we go from there.
I think it's extremely unlikely that I'll end up in court. The ex-boss is basically full of it.
Here's a little Billy Bragg as a fun ending: