HM Revenue Customs (administration fiscale et douanière), Child Benefit Office (NI) (bureau des allocations familiales — Irlande du Nord), Windsor House, 9-15 Bedford Street, Belfast, BT2 7UW.
HM Revenue Customs, Child Benefit Office (NI) (Belastingdienst, Bureau voor Kinderbijslag), Windsor House, 9-15 Bedford Street, Belfast, BT2 7UW,