Thanks for the reply,slowhands.

Yes, I tried the Consular BMD records, but no trace of an Alfred Syner in Buenos Airies in late 1880s/early 1890s.

You might be interested to know that Alfred and Hannah Syner (nee Weston) had a 3rd child, Mary Hannah Syner b.1885 (GRO reg. Newport vol.11A p.172). She was brought up by her aunt & uncle, Mary Jane & Thomas Scard, at 4 Jones Street (next door to her mother at no. 6 Jones St.) She can be found on the Census of 1891, 1901 & 1911, though the spelling of her surname is incorrect.
The daughter of the above Mary Hannah Syner, now in her 90s, is a friend of mine.

Polyanna