Tube strike: road craziness

Not surprisingly many roads in London are packed today.
Almost got taken down by a van joining the main road from a side road. Report a near miss or let them off this time, what shall I do?
PS Watch out, this happened to me the 1st time, and was dangerous. Vans do join the main road from the right, but normally leave enough room for you. This long van turns into my path from the right when I'm doing about 20mph. Then I see their front wheels now next to the kerb. Danger close! Immediate reaction: I don't want to end up under their rear wheels, bear right and better brace for an impact against their safety bar at the rear.
Was rather hairy...
Almost got taken down by a van joining the main road from a side road. Report a near miss or let them off this time, what shall I do?
PS Watch out, this happened to me the 1st time, and was dangerous. Vans do join the main road from the right, but normally leave enough room for you. This long van turns into my path from the right when I'm doing about 20mph. Then I see their front wheels now next to the kerb. Danger close! Immediate reaction: I don't want to end up under their rear wheels, bear right and better brace for an impact against their safety bar at the rear.
Was rather hairy...
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I did worry last time around as I wasn't back on the bike, and was still on train/bus due to balance etc after a fractured skull, though living on the edge of London it wasn't much busier in February around here.