Looking for Harding of Sevenoaks Kent England

I have found Christenings for Richard Harding and Elizabeth Harding at St Nicholas Church in Sevenoaks, Kent, England in 1779 and 1781 - These are two of the children of Richard Harding (1752)) a Baker by trade and Margaret.

Shortly after 1781 the family moved to Greenwich,

William Duddy Harding was born 1783 in Greenwich and Christened at St Alfeges in Greenwich.

By 1789 Margaret had died and her body was transferred to Downe in Kent along with William Duddy Harding who also died as an infant.

The Parish Clerk of Downe at that time was a James Harding - James we know was the son of a Nicholas Harding - how Nicholas/James are related to Richard we don't know. Maybe just a coincidence? Seems unusual to ship body from Greenwich to Downe without good reason.

Have checked but can find no marriage in Downe for Richard and Margaret. I am trying to find out where Richard married Margaret and her maiden name.

Richard Harding of 1752 from Sevenoaks is my stumbing block. Have been to Sevenoaks library and Bromley library to check Sevenoaks Parish records (St Nicholas) and Downe at Bromey.

Maybe Margaret from around Sevenoaks area? Any help on where to look next gratefully welcome. Richard