Accents - All Groups

Last week English comedian, Peter Serafinowicz, posted a video of a Donald Trump speech dubbed over with a London Cockney accent. The video went viral with over 1.5 million views to date.
Below is another video by Serafinowicz in which he has dubbed Trump with a posh R.P. British accent.

For comparison purposes, listen to the video below to hear what Trump really sounds like - the excerpt which the first video dubbed starts at around 9:00:

Tasks

1. Compare and contrast the pronunciation features - what do you notice about each accent (especially vowel sounds, stress and intonation)?
2. How does each accent affect your impression of Trump?
3. Why do people (especially British people) find the videos so funny?
4. What prejudices about Cockney and R.P. accents do the videos exploit?
5. How much do you think we judge people by their accent?
6. What do you aim for in your pronunciation of English?