South African state visit to the UK

The video begins with a greeting, followed by a question posed to the audience, and concludes with final remarks.

What do you think the speaker means by 'Hello up.'?

What could be the context behind the question 'What else?'

What does the phrase 'Can I?' imply about the speaker's intentions?

Why might the speaker simply say 'Say.'?

What significance does the name 'Kevin.' hold in this dialogue?