Hi Shaz,
My daughter attends an Educate Together school in Dublin and after first experiencing a single sex school for two years prior to getting her a place I have to say the difference is vast. ET completely adheres to the Primary Schools curriculum in all areas other than Regligion for which they have an etics based class. But ET's policy as a 'Child Centred' educator and their modern approach effectively means the experience for child and parent is fantastic, welcoming and I am thankful every day she is there.
Its a hard decision to make, good luck.