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I do wonder a bit about how this plays out but surely there are discussions ahead of the kind of announcements made which lead to conversations with the Treasury and given that they will have strong beliefs about what the announcements will create in the markets they then go ahead forewarned and prepare a strategy (i.e. short the pound in some way).
Certainly this was what Carney alluded to around the Brexit referendum.
Apart from this, which is something that is putting the fear into my colleagues. The BoE has a tiny foreign reserve at the moment. By comparison to other major economies anyway. Less than £100bn.
Edit:
https://www.reuters.com/markets/europe/britains-forex-reserves-wont-prop-up-pound-ex-boe-official-2022-09-26/