I have just had pointed out to me the attached short article in the New Statesman which reproduces the official version of the John Ward picture of the opening of the Ondaatje Wing at the NPG, of which I reproduced a detail of a different version a couple of days ago. John Ward stood on the balcony overlooking the scene painting it in situ and, as Pippa Bailey rightly suggests, it is a good record of the occasion (her father was Nigel Bailey, the excellent project architect):-

https://www.newstatesman.com/culture/art-design/2022/09/architecture-notes-childhood-audience-with-queen