The terrors of the earth.

Only days ago (Icons passim) I was writing about how uncannily I an McKellen's King Lear  echoed my poor reduced father. Then went to see him on Friday he was so furious that he all but paraphrased the Act 2, Scene 4 quote below.

I will have such revenges on you both,
That all the world shall--I will do such things,--
What they are, yet I know not: but they shall be
The terrors of the earth.

It was heart-wrenching.

My niece who did Lear at A-Level this year,  said that Simon Russell Beale was very interesting on Lear's dementia and said there was an NT You Tube video I should watch. I wonder if it is the one below?