If you look under "Incoming Passenger lists UK" you will find this family travelling under the name Hamiltom (although D'Souza is noted in brackets) on the P&O ship "Himalaya"running from Sydney to London in July 1950. They embarked in Bombay and arrived in London on 6.7.50. Henry Hamilton was 47, Barbara Gertrude35, HenryJohn 14, Peter Rodney 13, James 11 and Mary Claire Neville 10. They were heading for 73, Bentham Street, London E9. There is one oddity, there is a line through Peter Rodney's name - could he have been crossed off, left behind, mistake by the clerk? Hope this helps a bit.