every bit of that video has very good info. it only gets better from investing viewpoint.
and your question on SS HAS AN ANSWER,,,
As at 18 May, 2021 allotted, issued and fully paid: 693,258,674 ordinary shares of £0.01 and
The number of ordinary shares not in public hands amount to 135,389,407 equivalent to 21.5% of the issued allotted and fully paid ordinary shares.
UNRESTRICTED IS 557,869,267
This is correct as of 29 July, 2021