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It's clear that there were issues at hospitals (as expected cynical me thinks, knowing British healthcare...) but the fact that key infrastructure lost power does points to issues at the grid level as well (because sites that lost power did so based on grid procedures).

When they cut the power to an area, they can't selectively keep isolated locations active unless they are isolated in that they operate upon their own spur. That is why Hospitals would be deemed critical and important not to cut out, they are handled by onsight failover power supply in the form of backup generators.

In this case, it was like asking somebody to be able to catch a ball, they say they are ready and yet fail to catch that ball when you thru it to them. Is that the fault of the person who throws the ball or the person that was not prepared to catch the ball when they said they could.

In this instance it falls into the infortunate situation, and from what I can tell, you can't lay blame onto anybody or party for the failure and it is just one of those things. Sure leasons will be learned, but from the grid procedure in this hospital case, there will be no change I can see that would be learned. However the Hospital will be learning from this and may have more frequent testing and checks of their failover, may make changes. So if blame is to be leveraged upon anybody - you could say it would be from the party that had to make changes. But in this instance, would that be fair. Hence I would call this unfortunate and whilst lessons will be learned, you can not lay blame out of those lessons all the time. However - if it happens again and those same mistakes transpire - then, maybe you have some grounds to lay some blame.

The actual report says that Ipswich hospital wasn't part of the load shedding; so it's not clear why the generators had to cut in in the first place yet.

When the frequency is nosediving and below some threshold it is a good sign that you want to switch to your back up power immediately. Even if there isn’t ultimately a cut, it is bad quality power and a sign of system instability

I'm sure that they will learn lessons that railways, hospitals, airports should perhaps not be the first to lose power, that trains should be able to restart quickly, and that generators should be comprehensively tested to respond to real situations, and it will be no-one's fault.

I fully agree with you that this is the likely outcome.

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