 One child was born of this second marriage, Janet Cyrilla Hamilton (19 September 1946- 16 April 1955)

Between 1934 and 1946 Belhaven was an administrator in the Colonial Service in the Aden Protectorate, during which time he initiated an archeological excavation at Shabwa in South Yemen, the results of which were described in the "Geographical Journal" in 1942.Some of the antiquities collected in this exercise were presented to the Ashmolean Museum in 1954, and others were sent to the museum at Aden.He recorded his experiences in the Arabian Peninsula in "The kingdom of Melchior