Having cogitated on this, I think we should let the state visit go ahead. After all allies keep promises to allies, don't they ? (Which the UK MSM are free to tack as a line while he's here, polluting our sacred air).
However, unlike the coronation, the police should do fuck all to keep protestors away (if I had my way they'd direct protesters as a public service). And make sure foreign press are given a ringside seat.
Is there a crowdfunder for the blimp balloon this time ? Sign me up.
I suspect if we wanted to we could organise a crown big enough to carry Air Force one to Buck House. Who remembers 2012 ?