I stumbled upon your message while trying to find out more information on a Thomas Whittaker who lived in Fitzroy, Victoria, Australia and who married his 2nd wife, a Mary Sparks (also spelled Sparkes) (b. 1801, Somerset, England) in 1847, Melbourne, New South Wales. Note: Melbourne was part of New South Wales at the time; what is now the Australian state of Victoria was established from New South Wales in 1852.
In case you are not aware of it, there is a good online biography of Thomas Whittaker, b. 1808, St. Mary's, Nottingham, England; d. 27 Mar 1878, Fitzroy, Victoria, Australia here:http://www.historyhome.co.uk/people/Whittaker/whittaker.htm
This is a link to the burial information for the mother of Thomas Whittaker, Hannah, and his 2nd wife, Mary Sparks Whittaker, Melbourne General Cemetery, Cartlon North, Victoria, Australia, in case you are interested:http://billiongraves.com/pages/cemeteries/MelbourneGeneralCe...
I am distantly related to Thomas Whittaker's 2nd wife Mary Sparks/Sparkes, so I don't know anything else about the Whittakers and nothing of the Glassfords.