Hi Milliepede,
That's interesting. Other families members believe he was a passenger on the boat to NZ, suggesting he would have been on the passenger list. We located the passenger list for the 22 May 1924 sailing from Southampton to Auckland and it refers to a Mr J Hickey, 18 years from the Irish Free State. My mother-in-law has a looseleaf booklet saying John was born in London in 1905, but raised in Ireland.
The above could tie in with the birth certificate of John Michael Hickey born on 1.6.1905 in Mortlake, London, whose mother was Catherine Hickey (nee McGrath) because McGrath is a family name.
Where did you find out that the first name of Mr J Hickey on the 22 May 1924 boat was John?
Many thanks