Character accents - Forza Horizon 4

Hello there,
I’m having fun editing clips of the new Forza game, and saw a gap on YouTube for making video on the cast that appear in game. I’ve already finished one, but I need help on identifying the regions of a number of accents.
So far I have:
Keira (south Ireland)
Alex (Scotland)
Joel (south England)
Mike (north England)

I need help with identifying the regions for Rebecca, Jamin and the radio presenters. Responses greatly appreciated. Also have link to first video below. Feedback on the video greatly appreciated also.
Kind Regards,
A sober Irishman

MistaJam (Horizon Block Party) is from Nottingham (East Midlands)

You could look up the voice actors on IMDB. As far as I know, most of them use their native accents.