Hello Mike, I have found more information on this family.
WILLIAM DARBY married MARY BEAN (licence) the 4 dec, 1760
children:
1.JOHN DARBY c 5 jan, 1764 branston
2.THOMAS DARBY c 4 may 1766
3.JAMES DARBY c 23 april, 1769, died 27 sept, 1780
4.JOSEPH DARBY c 20 aug, 1772, buried 30 jan, 1773
5.ELIZABETH DARBY c 15 may, 1774,buried 22 jan, 1782
William I have buried the 19 march 1788 (PAUPER)
I would like to know who THOMAS DARBY married and where WILLIAM DARBY (father) was born if its possible. thank you