I call those the "Unexpected Unknowns" We will never know them and never be part of it. All we can do is observe and munch off some pips into our own coffins.
From my past experience the Brits must leak their information to BIG players before the data releases, sometimes it could be 5 minutes to 2 hours in this case. Unless there was another reason for that
I think the drop of GBP/USD might go further than 1.5900 and lower to end the weeks trade, especially if the NFP numbers will be positive. They must be for the Holiday season! So this might be perfect time to sell the pair.