the third one involved a domino theory collapse of lever arch files that started at the far end of my neighbour's desk and terminated at my cup of coffee, which I was nowhere near at the time.

That's like the time my aunt's parked car was totaled by a pizza truck that had been parked up the hill from her. The truck's brake failed. Neither driver was in the vehicle at the time. They both got back from their respective errands and stared. Wow.

It physically doesn't match the instructions given on Youtube for that model. This is what happens when you buy what turns out to be an end of line, probably built after a pub-lunch, model.

Just out of curiosity, what is it? (Bertie Owen got his name because he has only one fan. His model is supposed to have two.)