I have now discovered where JP came from and that the previously listed possible parents are nothing to do with the family.
His family were these:
John PHILP (1772-1837) of Sheet and Jemima WALBRIDGE of Sheet ( 1770-1847) were married 24 Jun 1798 in Petersfield, Hampshire. Witnesses John Caplin (? a cousin or uncle?) and Hannah Saunders (JW's sister)
Their children all christened in St Peter's, Petersfield, Hampshire:
1) Jemima 5 April 1801 prob. Married William Digweed, 20 May 1819 in Froxfield, Hampshire. They had 9 children in area.
2) John chr. 17 Feb 1805
3) Henry 19 Jan/June 1808, probably married Hannah Elizabeth WALKER 7 Dec 1835 in Bermondsey.
4) Jane of 2 June 1811, married Samuel Joshua Chapman RETTER on 1 Jan 1826 in Cheam, Surrey and migrated with John on “William Betinck”, 1841 to NZ died in Wellington, 22 March 1900
5) Martha 29 August 1815, married James DABB on 26 Oct 1834 in Morden, Surrey. Died 1897 Blue House Cottages, Merton Road Mitcham Surrey and James in 1899.
6) George 6 Nov 1818 , married Lydia Dabbs 11 Oct 1840 in Merton, Surrey and they had a son, John chr. 4 July 1841 in Malden. Lydia died in 2nd Q 1843 (aged 23) and looks like George remarried a Harriet Avery (George Phelp Married Harriet Avery 1st Q 1848 Kingston
Harriet Avery c 21/10/1827 Morden parents William Avery & Sarah Hore Married 23/1/1824 Newington Surrey), because in the 1861 censes they're living at Cheam with 4 children. This censes suggests that he was born at Malden and it seems that they probably did move there before 1818 because they talk about 'growing up in Malden'.
George died in the Croydon area of Surrey in 1st Q, 1880 (aged 62) and his wife in 4th Q, 1889 (also 62).
John Philps senior is listed as living in Sheet for Jane, Martha and Georges births and a 'labourer'
This was found out because he was one of the "7 servants of Ham House" (Tollemarche family) who were sent to NZ from an estate in Ham, Surrey. 9 letters for this group were published in the NZ newspapers and they revealed that two of the others in the group were his sister and brother-in-law. The letters gave us several siblings and his mother's name and then it was relatively easy.
JP senior and Jemima buried in Surrey
John PHILP born c. 1772 and buried 14 May 1837 in St John the Baptist, Old Malden
Jemima Walbridge born 2 June 1770 (chr 4 July) and buried on 24 Sept 1847 in St John the Baptist, Old Malden
Would love to know if anything more on the registry and whether there are headstones.