I have recently made significant progress on this topic, so felt it would be helpful for future readers to summarise what I now know.
The breakthrough came when one Bruce Simons in France pointed me towards the following information about MJT in an unpublished book on the Treliving family written in 1995 by Lynne Browning. On page 426 (see attachment) we find a transcript of her marriage record telling us that she wed Thomas James Longhurst Manning at the Register Office in the District of Westminster 31 July 1863. He was Age 25, Bachelor, Gentleman and his father, Thomas Allen Manning, was also a Gentleman. She was aged 21, spinster, father Joseph Treliving, retired tradesman.
The fact her father is named as Joseph, and her age of 21 fits with a birth date of 1843, convinces me this really is 'our' MJT. Note that in the court case discussed above MJT explains she was actually aged only 19 at the time of her marriage, not 21.
On the same page of her book Lynne Browning writes “
According to her brother Alfred (H43) writing in 1879 she had no children at that time. Family information informs that she died at Knowle House, Knowle Road, Brixton, London on 21st October 1880 but the GRO Index does not show her death under Mary Jane Manning in that quarter of 1881. “I then found (on FreeBMD) that MJT had in fact remarried in Lambeth in Q1 1878. Her husband was Thomas William Trodd. Using her new surname I could then easily find her death/burial record at
https://www.familysearch.org/ark:/61903/1:1:CXCJ-TG2M Name Mary Jane Trodd
Sex Female
Age 37
Residence Place Brixton
Address 58 Knowle Road
Death or Burial Date 25 Oct 1880
Death or Burial Place Lambeth, Surrey, England, United Kingdom
Death or Burial Place (Original) Lambeth, Surrey, England
Birth Year (Estimated) 1843
Event Type Burial
Cemetery South Metropolitan Cemetery
This record confirmed both the Knowle Road address quoted by Lynne Browning and is also perfectly consistent with the 21 Oct 1880 death date she gives.
I have checked GRO indexes and it seems that during the three years they were married they produced no children.
Thomas William Trodd can be found in the 1881 Census, held just a few months after MJTs death, as a lodger at 4 Chelsham Rd, Clapham, described as a Widower. A couple of years later, on 23 Aug 1883 he remarried in Stockwell, Lambeth, his new wife being a widow aged 28, named Jane Amelia Hugall. They can be found together in the 1891 and 1901 censuses. They produced no children, and Jane died Q3 1904. Thomas William, whose occupation was Stockbroker, lived on until 16 Nov 1931. His Probate tells us his career was very successful - he left £18,725 - but clearly he was far less successful at producing any heirs to leave his wealth to...
Last, I have failed to find out more about Thomas James Longhurst Manning.
That is as far as I'm going with this distant branch of my 'Nodder' family.