https://freepages.rootsweb.com/~crossland/genealogy/index.htmThe Slains Castle........commissioned in 1850 by the Family Colonisation Loan Society to carry its first sailing of emigrants bound for Australia.
The Family Colonisation Loan Society was a body which was founded by Mrs. Caroline Chisholm on her return to England after 7 years in Australia. It was a philanthropic organization dedicated to assisting families of an "industrious and frugal class" to make a paid passage to Australia in relative comfort and safety. It also invited persons already in Australia to sponsor relatives to join them.
Slains Castle departed London 28 Sep 1850...arrr Port Phillip 25 Jan 1851.
Is this your James GIBLETT selling up to leave for Melbourne...and suggestion of relative in Sydney?
The newspaper archive is a paid site. You can see enough accreviated fext to suggest if it might be of interest to you.
Use Britishnewspaper archives
https://www.britishnewspaperarchive.co.uk/Select....England
Select....London
Select...1850-1899
Search term......."James Giblett"
Finds - Standard of Freedom 8 Jun 1850 p14
...brass founders—W. Forder, T. Forder,and ll. Brett, Southampton, wine merchants—JohnGiblett, Sydney, New South Wales, and James Giblett, Vere-street, Lincoln'sinn-fields
Morning Advertiser 26 Jun 1850 p4
.....on the premises, Lordship-lane, Tottenham, on Thursday, July 4. atll order of the Proprietor, James Giblett, Esq , who is 'leaving the residence,