It's not very well known but Steven Bartlett (star of BBC TV's "The Apprentice") was once a battle rapper.
He battled a few times on the UK battle platform Don't Flop as "Lyricist" :https://versetracker.com/rapper/lyricist - the Youtube videos of which are now 'private'. There was however a clip of him batting Rawsoul in a Don't Flop event highlights reel (which since I published this article has also been made private - hmmm). Someone clipped it though....