Hi
No, I don't think we will find a marriage, Monica.
I can't see an exam for Clara in Chelsea, which is a bit disappointing.
We can't be sure about who Edmund's family were, but just going back to Edmund Richard White the artist, born circa 1828 (he says in Clerkenwell), father of EJR born 1851.
It looks like by 1881 Edmund senior, age 53, has moved to Hammersmith(!) with a new young partner
https://www.familysearch.org/ark:/61903/1:1:Q273-Q4VQElectoral register, 1890, has an Edmund Richard White at 10 Percy Road, Hammersmith, which is very near indeed to Edmund/Edward + Clara, who were living in Davisville and Haydn Park Roads (1891 census, electoral registers, and Monica's school records)
Another newspaper sensation!
From July 1889
Edward Richard White, 61, of respectable appearance, an artist, of Percy Road, Shepherds Bush, charged with sending an explosive substance to John Theodore Tussaud, at Madame Tussaud’s Exhibition
He went to the Old Bailey
https://www.oldbaileyonline.org/browse.jsp?id=def1-631-18890729&div=t18890729-631P.S. Hope it's the same guy!