CREATE TABLE table_74066 ("Episode No. Episode No. refers to the episodes number in the overall series ,  whereas Series No. refers to the episodes number in this particular series." FLOAT, "Series No." FLOAT, "Episode" TEXT, "Director" TEXT, "Writer" TEXT, "Original airdate" TEXT)

Name the original airdate for robin mukherjee and margy kinmonth
SELECT "Original airdate" FROM table_74066 WHERE "Writer" = 'Robin Mukherjee' AND "Director" = 'Margy Kinmonth'
SELECT "Original airdate" FROM "table_74066" WHERE "Director" = 'Margy Kinmonth' AND "Writer" = 'Robin Mukherjee'