Sorry -- I have additional info that I left out of previous post:
Robert Tiblrook was baptised 26 April 1795 at Castle Camps, Cambridgeshire.
He and Millia had other children:
Charles, bapt 1817 at Helions Bumpstead (married Harriet Reader, went to South Australia in 1855);
Harriet, bapt 1819 at HB (my ancestor -- married John Cooper, went to South Australia in 1859);
Stephen, bapt 1921 (married Eliza Cock);
Mary Ann, bapt 1824, died aged two month;
Sarah Ann, bapt 1825;
Samuel, bapt 1827;
William, bapt 1830 (married Anna Coote, went to South Australia in 1855);
Emma, bapt 1933, died aged 23 in 1856, buried HB;
Eliza, bapt 1838 (married Henry Watson).
As you see, I have no idea of what happened to Sarah Ann or Samuel.