My exH and I only have an informal arrangement regarding our 50/50. He receives CB (as it was convenient at the time) but he's refusing to pass it on to me so I can claim UC. There's no clear primary carer as our DD is registered at both addresses for school, mine at the GPs and his at the dentist. I've called different organisations (like CAB and turn2us) and they both said I need CB to claim UC. Working families doesn't think so and is looking into it. Any words of advice?