As a starting point
Marriage from FreeBMD
Sep q 1896 Barton Regis 6a 279
Caleb William DAVIES
Elizabeth Emma SMITH
marriage details family pilot search
Caleb William DAVIES age 26 (1870) father George
Elizabeth Emma SMITH age 22 (1876) father Thomas
1896 St. Matthew Moorfields, Bristol, Gloucester
birth family pilot
Herbert Caleb William DAVIES
14/11/1897 Moorfield, Gloucester
parents Caleb William DAVIES Elizabeth Emma
**ADDED**
herbert also died in perth, western australia on dec 25 1962.
all i know was that he was born in cardiff wales (that is on his death cerificate)
I have re-checked and can find no Herbert born in Cardiff Wales to Caleb William DAVIES and Elizabeth Emma SMITH, only the one above who was born in Gloucester which is in ENGLAND - I hope that the above is the one you are looking for

Gloucester is some way from Cardiff by car the journey takes around 1hour 30mins.
Here's a map
http://www.censusfinder.com/map_unitedkingdom.htm