Are they in Australian immigration / Census data ?

Are you researching Rachel Latelia CURTIS 1874 from Westbury on Severn. I'm looking for a Rachel Latelia Curtis who happed to end up in Perth Western Australia married to a john CASEY.

Cheers

Chris

http://www.old-maps.co.uk/ co-ords 360810,216500

She has this marriage:

Record_ID: 9861
Entry Number: 85
Year: 1873
Month: Aug
Day: 24
Groom Surname: CURTIS
Groom Forenames: Charles
Groom Age at Marriage: 21
Groom condition: Bachelor
Groom Rank or Profession: Quarryman
Groom Residence: Lydbrook
Groom Father's Surname: CURTIS
Groom Father's Forenames: John
Groom Father's Rank or Profession: Labourer
Bride Surname: ROBERTS
Bride Forenames: Catherine
Bride Age at Marriage: 21
Bride Condition: Spinster
Bride Rank or Profession:
Bride Residence: Lydbrook
Bride Father's Surname: ROBERTS
Bride Father's Forenames: John
Bride Father's Rank or Profession: Labourer
Licence or Banns: Banns
Date of banns:
Signature or Mark: he sign she mark
Witness 1: Mark Coles
Witness 2: Fanny Robinson
Other witnesses:
Officiating Minister: Henry Tho[ma]s Hoitt
Event type: Marriage
Memoranda:
Transcriber's Notes:
Register Reference: P208 IN 1/5
Page No: 43
Parish_Chapel: Lydbrook
Soundex Groom: C632
Soundex Bride: R163

They had a daughter Rachel born 1874. I can only find this baptism, which someone forgot to enter the forename onto:

Record_ID: 103696
Entry Number: 62
Year: 1874
Month: Mar
Day: 29
Parents Surname: CURTIS
Child Forenames: [not stated]
Father's Forenames: Charles
Mother's Forenames: [not stated]
Mother's Surname:
Place of Residence: Vention
Occupation: Collier
Officiating Minister: George Burbidge
Event type: Baptism
Memoranda:
Notes:
Register Reference: D2598 3/4
Page No: 0
Parish_Chapel: East Dean Methodist Circuit
Soundex: C632

Where is Vention please? Pam cannot find a baptism for Charles, his father John or Catherine. Neither is there a marriage for John. So where did they come from - and where did Charles go? All help gratefully received.

Chris