Karate Shoukoushi Kohinata Minoru - Vol. 38 Ch. 389 - World Tournament Opening

[MangaDex]

 

[Monochrome_Scholar]

"British champion Way" is absolutely David Haye.

 

[Hirogaru]

@Monochrome_Scholar
Yep, 100 for you.
Even tho Haye is a boxer not a kickboxer, but that looks+ "British Champion" are enough to explain that it's inspired by him