Justin: Thanks very much! That's pretty good for a start. I must admit that I have been using Amsterdam Cemetery (Muiderberg) records to research my father's side and had not yet thought of trying Rookwood (which is "only" 1000 km away, but presumably web accessible; Amsterdam is more like 12000) for Philip and Jessie.
There are three quite old surviving children of Philip (two aunts and an uncle) in Sydney and I will ask my cousins to talk to them if possible. This could take a while, but may yield extra information.
The birth date I trust came from my (now deceased) uncle, Bernard Solomon Cohen, who had an interest in these matters; he was born in Glasgow.
Why do I trust him more than Philip himself?
1. Philip's marriage record [Statutory Marriages 644/15 0043], which is for 11 January 1910 gives his age as 26. This would indicate a birth date on or after 11 January 1883 and before 11 Jan 1884.
2. Other information on Philip's 1916 Alien Registration Form (it is in his Naturalization file, but is not his certificate -- that WOULD be nice to have; but no one seems to have it) looks to be incorrect. He says on the Registration form that he came to Australia (the Commonwealth, but in those days that was the same thing) "about 1910". In fact Bernard was born in Glasgow on14 January 1912 to Jessie. This makes Jessie's statement that she arrived in Australia in 1911 wrong.
Also, assuming Philip was his son's father (which we have no reason to disbelieve), conception happened around April 1911. In Glasgow, unless these poor Jewish immigrants made very frequent intercontinental voyages! It's always possible that Bernard was the result of one last night of bliss before Philip sailed (assuming he came here before Jessie, which was common), but even that makes his arrival date wrong by a year or more.
The upshot of this is that I suspect Jessie and Philip did not take too much meticulous care in filling out their Alien Registration forms in 1916 -- but I'd be happy to be proven wrong.
BTW Jessie's age at marriage is given as 19. This makes her birth year 1890/1891.
Cheers and thanks again!
Geoff