a disappointed prince harry will tonight fly out of the uk to australia without seeing his new niece or nephew .
with the duchess of cambridge now overdue for the birth of her second child , the prince will not be able to meet the new royal baby until he returns to this country in mid may .
harry , who will be bumped down to fifth in the line of succession by the new arrival , had returned briefly at the london marathon after undertaking several engagements in turkey to mark the centenary of the gallipoli campaign .