that for 2 decades + I have been travelling to Waterloo where increasing numbers of Inspector Sands folk stroll about, increasingly laden with kit - a main weapon on a sling, pistol in a holster, a taser, more traditional beating equipment etc - and I often find myself wondering what I would do if there was an event.
My plan is that I would stay on the platform if I was just getting off or on a train, and if there was shootage then I would duck behind the pillar in the mid platforms that has the Upper Crust sandwich thing on the concourse side. On the rail side it has a large steel plate about 12mm thick as the back wall. It might offer some protection. Failing that I'd go for a pillar.
If it kicked off in my vicinity when I was concourse side I would scarper for the exit or duck down the tube steps.
An umbrella or golf club should not be underestimated as a defence weapon. Cricket bat also. Umbrella - have it. my frend, in the eye, the other eye, the nose, the neck, one to the plumbs for good measure. Cricket bat - back and across, cut or ramp his jawline for 4 unfieldables. Golf club - Happy Gilmour to you, mon brave.
Feel free to travel with me for your own safety.