I was being reported for fraud, so while I could have given my details and walked off, I think it would be silly to do so.
The reason it took so long was there was a process where he had to write down a series of questions for every offence, starting with every offence for a certain number of days, then weeks and then months. I can't remember exactly what it was - but it was a LOT (over 10 pages of his notebook, with the same few questions asked repeatedly).
The questions were along the lines of, did you travel on this date... did you travel with (tickets carried - in my case a Z1-3 ticket and a Z4-6 ticket) and did I attempt to avoid paying my fare.. For those that didn't know, yes he was reporting me for fraud for not having a ticket valid between zones 3 and 4 (and ignoring how the zonal system works). That's why it was cancelled so quickly, along with a big apology and some 'retraining'.
In normal circumstances, I doubt it would take so long. Spare a thought for his colleague who had to sit idly by waiting for this interview to take place outside the station by the buses at Finsbury Park station!
The upside is that all staff got a bulletin to remind them that a Z1-3 and Z4-6 ticket combination is valid to cover all six zones, using my exact ticket combination (starting from Hatfield with the Z4-6 ticket) as a case study! What a shame I've not renewed my season ticket with FCC this year!
(Anyway, apologies for hijacking this thread with something that's rather off topic)