At least in the men’s game, getting your kid into a club’s youth academy is dirt cheap, because the clubs subsidize it. Idk about the women’s game though, but I imagine they don’t subsidize that, so it’s predominantly wealthier families that can have their daughters play soccer, hence why England’s women team is predominantly white.

Also for the men’s team, the reason why a lot of the team is black is because the vast majority of black people in England are of Jamaican descent.