I'd been intending not to try out a 345 until I could combine it with a ride through the Crossrail tunnels, but the co-incidence of the postponement news arriving on the same day as my Freedom Pass made me decide perhaps I'd better not wait that long - and I had to try my pass out somewhere.
As for the train - I'm glad I was only going from Stratford to Liverpool Street: seat backs too high, and too hard.