Hi all,
Thanks for the magnificent reponse. I have a great deal of information on William Rufus including all the sources that you have listed.
In reponse to your particular questions though, here goes.
William was married twice:
1st to Sarah Anne

? around 1851 (calculated from the Census 1851 Brenchley, Tonbridge HO107-1615-429-18 (Joseph Diamond)).Joseph, I believe, was her father in law.
William and Sarah had two children, Frances Isadore Matilda (b. 1852) and Edward Adolphus (b. 1855).
2nd to Amy Joy - Marriage Certificate of Diamond William Rufus and Amy Joy 1885 in Gillngham, Kent. This has given me the name of Williams father as Joseph.
I have not found any issue to this marriage.
In repect of William Rufus I am looking particularly to find two sources:
(a) his birth or baptism certificate, to confirm his parents,
(b) his marriage certificate / banns details to Sarah Anne so I can get her sir-name.
If you need any more info please let me me know.