    Sentefice 4: The British ambassador to the United Nations  1 Sir Jeremy Greenstock’, is Scheduled 0 lead-a Secutity  CojincilMissian to.the region tn mid-May.    Sentence 2: Sir Jeremy Greenistock , the UK 's ambassador  _ to the UN , is due to lead ‘a week-long Security Councit  mmission to West Africa in mid-May.