- Customer had a seemingly very dodgy, but valid ticket according to the Routeing Guide at the time.
- Ticket refused by the gate and told to sort it out at the excess fares window.
- Customer told ticket not valid at the window and needed to buy new ticket.
- Customer forced himself through the gateline.
- BTP called and gateline staff/security gave chase.
- Allegations were made about possession of a gun, presumably BTP were unable to attend for whatever reason. (I didn't witness this bit but no reason to doubt it.)
- Chase carried on into the LUL station, gateline staff/security lost the customer. At one stage, I believe attempts were made to try and halt an LUL service but that was refused (of course).
Truly one of the most bizarre incidents I have seen. To be fair, unless you have closely scrutinised the Routeing Guide, you would not have imagined that ticket being valid that way, with both origin and destination inside the zonal area, and the route going a long way outside it.
Due to the length of time that has elapsed, some of my memory may have been a little hazy, but that's by and large how it escalated.