Wolfiez talks with a teenager's working-class intonation and he uses colloquial words, which makes it a bit more difficult to understand him, but the subtitles will allow C1 students to follow it. You will come across new words like: "e-sport, chill, quid, set-up, too fancy, step, mortgage, to frame, logo, to be plastered, to take pressure off me, childminder, living day-to-day, you are clock watching, to moan, to strive to do something".
If you want to watch an interview to Wolfiez and his mum one year before when he had just won all that money, you can click below on this "Good Morning Britain" video on ITV , which has subtitles and it is also suitable for C1 students: