Hi Sarahjane,
I'm sorry, but I have no further information on Kendal. He was not buried in C of E Faversham parish church - maybe in Preston or Ospringe, but I don't have those records readily available. So, I have no idea what his occupation was.
I do, though have Mary in 1851 as follows:
D3C P18
BUESDEN Mary head widow age 50 born at Milsted, Kent
WATERMAN James lodger unm 47 Sutton
LAYWELL Richard lodger unm 37 Queenborough
Sorry I can't be of more help, but maybe, at least, Mary's birthplace from the census can get you started on her line and help to determine, at least, the latest time that Kendal could have died.
Good luck!
Best wishes,
Susan