Wouldn't say that's the case with either the senior or junior teams now to be honest. I mean at both levels the best players generally tend to play for the best clubs so there'll always be a bit of a leaning towards the bigger teams, but most England youth teams include players from 10+ clubs.Youth caps mean nothing, especially when you play for a northern team that’s not. Liv, Utd or city. Just look at any England youth squad. Dominated most of the time by London teams. And a few from the northern media darling teams.
The youth teams like England’s first team, is picked by who you play for first.