Thanks to everyone who has helped me by posting on this topic. As suggested in an earlier post, I emailed the archivist at the Sisters of the Church in November 2013. In June 2014 I had a reply. Well worth the wait I can tell you! I was emailed a copy of the shortened Register of Birth, copy of baptism register, rules of the orphanage, and application form which the relatives had to sign to get the children in to the orphanage. Also, details from the orphanage register, including that their first names were changed at the orphanage to a version of the original, their dates of entry and leaving, and their occupations on leaving. They went into service and for one of the girls, it had her places of work for 10 years after she left the orphanage. As others have said, more documentation than on any other relative! Please be patient if you ask for info, it is worth the wait.