EFL teams often scout Scottish and Irish players, while Premier League clubs tend to poach from the EFL and the best players from all UK leagues. Walsall appears to be benefiting from its ownership, but there are some hidden talents that wouldn't be discovered if lower clubs didn't recruit from the Irish leagues. You don't see much success the other way around, with clubs signing from League Two, except for a few cases.

there is a good chance young players will be able to get first team experience and where there is that exposure then talent will be found. scotland has had bursts of it in recent years, so the uk does have talented players which league one and two teams are looking to invest in.