Hello Malcolm,
I'm actually searching in Ontario, as I believe my great-grandmother (Sarah Ellen or Helen Lawless) went to live at the Marchmont Home in Belleville, Ontario, after arriving in Canada.
Where did you find out about the 1901 UK census? My great-grandmother would have still been in England at the time, perhaps she'd be in the census then.
Also, you mentioned a Middlemore Home... would that have any connection to the one mentioned at this website
http://www.institutions.org.uk/orphanages/middlemore_home.ht... ?
Thanks,
Jessica