The first person is Paul O’Grady, a comedian/presenter who has a strong ‘scouse’ (Liverpool) accent. The next clip has David Tennant (whose Scottish accent I assume you understood as he speaks clearly) and comedienne Catherine Tate, whose schoolgirl character speaks in an urban London accent, known as “jafakin’”, a fake patois where white kids try to sound urban black American, with a bit of Jamaican thrown in. The comedy character ‘AliG’ satirised this.
DO remember we Limeys and Irish equally struggle with many American accents, some we understand but just don’t like, like the Boston/NE accent.
I found part 2.
This one is with Lauren Cooper (Catherine Tate) and PM Tony Blair.
https://www.youtube.com/watch?v=sfkjvagVsRI