It may be possible to narrow down our short list of likely ships. Does the war diary mention a stop in Capetown? According to a website I have found on the routing of WS19P from Freetown, both Laconia and Santa Rosa went to Capetown first and only Christiaan Huygens of our three was routed direct to Durban.
C
Could you give us a link to the website you quoted? The War Diary says they sailed directly to Durban after replenishment at Freetown.
What is interesting is that the movement card of CHRISTIAAN HUYGENS taken from BT389/35/119 coincides with the dates arrival and departure at Freetown, Durban and the date of arrival in Suez as the War Diary. It also states, she was part of WS19P.
I would say, given what we have. There is a strong possibility that CHRISTIAAN HUYGENS was His Majesty's Troopship H7 for the voyage in question.
what do other's think?