Ancestry passenger lists reveal an Edith Voss aged 49 (right age) returning from Durban South Africa on 4th May 1931 with a Sidney Voss.
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The following notes by Blain concerning Edith WENHAM were passed to AJRV by Marilyn Wilkes, and need verification:
(1901) book keeper for a house furnisher Eastbourne 
born Mar ¼ 1882 Eastbourne co Sussex
baptised 01 Apr 1883 Etchingham co Sussex  

The following looks wrong:
half-sister to Henry Noakes KEELEY born Mar ¼ 1875 Burwash registered Ticehurst Sussex 
half-sister to Elizabeth Selina N KEELEY born Mar ¼ 1878 
sister to Anne Selina WENHAM born Dec ¼ 1880 Etchingham registered Ticehurst
sister to Eliza WENHAM born Dec ¼ 1881 Etchingham (1901) at home with family Greenwich 
daughter of George WENHAM born Etchingham (1901) errand boy 
(1881) fly driver, of Station Rd (shop) Etchingham co Sussex 
(1901) gas stoker residing Greenwich 
 born Mar ¼ 1848 Rye co Sussex 
 married Sep ¼ 1880 registered Ticehurst, 
 and Harriet KEELEY née SHOWBRIDGE – could be SHERWOOD?
 [Harriett SHOWBRIDGE married (1) Dec ¼ 1872 (Tunbridge) Robert KEELEY died Dec ¼ 1875 aged 34 Ticehurst]  
 (1901) with George, residing Greenwich 
 born c1855 Etchingham registered Ticehurst co Sussex; 
 died unmarried

Added December 2012:
Edith appears to have separated from Herbert between birth of Mollie in 1902 and 1911. This explains why she was not in the ‘Four generations’ photos taken in 1906.
By the 1911 census, when she was aged 28, she was in Ryde, Isle of Wight with Mollie and a surgeon Thomas THOMSON aged 50.
It is certain Edith and Mollie went to Australia soon afterwards, and brother Geoffrey followed when he had finished school.
When Mollie married there in 1924, she did so as Gladys Mary Thomson.
From this we can conclude that Edith had taken up with Thomas Thomson, and they were married in law or in effect, and Mollie took his name.

Not yet (Mar 2015) found arrival in Australia.
A Miss E M Thomson arrived Sydney from London 17 Oct 1912 on the Marmora. There was also on board a Mr Thomson (Bookseller) and his wife


There was another Edith Wenham in Hastings or St Leonards-on-Sea, who married Mr Herbert Stevens on 1st Sept 1909. She was the daughter of Mr A B Wenham. In January 1902 that Edith gave a recitation at the St Saviour’s Band of Hope2337. In February she gained 2nd prize for a recitation in the same organisation.2338