An interim report [Interim Report into the Low Frequency Demand Disconnection (LFDD) following Generator Trips and Frequency Excursion on 9 Aug 2019] has been made by the National Grid concerning the events leading to the power outage. The documents tend to disappears here is the frequency/time plot from the document:
Of interest is the fact that after the initial failures at Hornsea and one of the turbines at Little Barford the system begins to recover. Then another 2 of the Little Barford generators is manually removed because of steam overpressure.
It is at this point the system crashes out and load is shed.
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