I saw a video on Youtube last month or so of a girl who seemed to be interviewing to be a WAM model. She was blonde and British and as part of the interview she had to take lots of pies and slimes. I'm wondering where the video is from and if anyone has it

Kind of sounds like a Most WAM video. They have a series where they run "interviews" with new girls. And they are based in England. If it was MostWAM, you should be able to find it in their store. Someone would have uploaded it to YouTube illegally.