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The "Andrews Newspaper Index Card" collection has a mention of a 20th Anniversary in 1950, of a couple Geoffrey Elwyn Lloyd Rees  (Lloyd Rees being a double surname), and a Julia May Lowder, that married 03 Feb 1930, at Ste. Andre, Biarritz. Sadly, I have not yet found the actual article.

This couple, with the double surname, does appear in the 1939 Register, but we can't discuss the details of that. (copyright).  However, there is a name blacked out with them, which usually means a child, who may still be living.
Hopping over to https://www.freebmd.org.uk/cgi/search.pl  if you click to search births, and enter surname as just "Rees", and mother's maiden as "Lowder", you will find a possible daughter.

The https://www.britishnewspaperarchive.co.uk/  carries some English language papers from China, and there are some mentions of the family.

The Carl Smith Collection (Hong Kong) has a few items on the family as well.  I think I can direct link;  make sure to use the arrows to scroll, as Carl kept names together, so there may be more than one card per entry.  Click to get to the end of each entry, and you will find the download link.
https://search.grs.gov.hk/en/searchcarl.xhtml?names=lowder&page=1

IF this is his parents and some siblings in 1911 at Moore Place:
http://www.census.nationalarchives.ie/pages/1911/Cork/Cork_No__7_Urban__part_of_/Moore_Street_Place/397036/

then he could be the Joseph Kelleher in the Royal Field Artillery, joining in 1919, served in Mesopotamia, and discharged in 1923 in Woolwich.  His year of birth on attestion works out to be 1892, but a later army document, 1890.  The army records gives age in years and months,  and the month of birth wobbles as well, so not perfect.
 His address on discharge was to be 7 Moore place, (not house 6, like in the above 1911 census), and when he signed up, he listed an address for his father (no name given), of 2 Welsh's Square, Cork.
Service number    1044794

Picture of Herbert Torr

(no sub required to view)  https://www.newspapers.com/article/evening-telegraph-herbert-torr/147291317/

A few more tidbits, but nothing so far about the name change:

Derby Daily Telegraph  30 September 1942

Mentions Herbert's sister as being Mrs. R. A. Long, of 76 Cambridge-street, Derby, and that Herbert was the youngest son of the late Mr. and Mrs. Torr formerly of Shaftesbury-street, Derby.
Herbert was on the submarine HMS Thorn when lost. Herbert's home address was Brownhills, Staffs, and he attended Reginald-street School, Derby,  before volunteering for the Navy at age 16.

The Walsall Observer, and South Staffordshire Chronicle.   13 March 1943

Herbert's brother Albert states that Herbert's wife died about 18 months ago, and the twin sons were in a "home for sailor's children", and the baby daughter was with a grandmother, Mrs. Howdle, of Linden Road, Brownhills.

Yes. Presumably Edward would have had regular business at the Geashill Castle house, in his role as bailiff, and met Rosamond there. I assume she was working at the house but quite why she came to leave Kent for Ireland is unclear.

If I am looking at the correct family, some of her siblings were born in Ireland, presumably due to her father's occupation (RN - Coast Guard).  This might explain the back and forth of her movements between England and Ireland?