Are under 11/12 teams not mixed (boys and girls) or does this only apply to younger age groups? If you check the Evening Herald during the week (can't remember what day - possibly Monday or Tuesday) it usually has a big section on underage football which might be of use.
Thanks for that Clubman. As far as I know 'schoolboy' teams can include girls in their teams up to age 14. But there is a 'girls only' summer league, I'm just trying to find some info on any teams from these areas who play in this league.