The only news I saw other than the UK jobs report, which was not the catalyst for the GBPUSD nosedive, was this that came out within the past hour:
BOE Chief Economic Pill says there is still some work to do on the persistence of inflation; not unreasonable;e to believe that over the summer the BOE will see enough confidence to consider rate cuts….Source; Newsquawk.com
If this was the catalyst for the (over?) reaction down in GBPUSD, it is yet another indication of how hyper-sensitive markets are to any news that might impact interest rate cut expectations.