I suspect the wind farm was turned off for safety reasons, due to high winds, although the current green agenda will mean that's unlikely to be announced, as the Daily Fail and co will headline with wind farms can't handle wind.
As the grid would have been aware that some of the silly wind things were at risk of approaching their working safe limits, you can bet they had as many traditional generating systems running at full capacity due to the time they take to fire up, and the stored energy ones fully ready on standby. And possibly a lot of the renewables were already off for forementioned safety limits.
If that theory is correct, it shows we currently have too much reliance on ultimately unreliable renewables. The Bedford one might have actually failed due to not being fed enough power to run it - which was what happened at Chernobyl in the 80s, but again we'll never know, because there are other agendas at play.
Although the power cuts were widespread, they were patchy, which shows the grid were managing it - this will be so much easier when smart meters are universal.
And for those that believe entirely on the announced timings, my UPS logs show my power had gone off significantly before the stated times of the 2 generator failures, and had been browning out before that, which shows the power availability was already under pressure, and that cuts were already being managed. So something smells.