CREATE TABLE table_26160 ("Episode" TEXT, "First broadcast" TEXT, "Davids team" TEXT, "Lees team" TEXT, "Scores" TEXT)

When david o'doherty and katherine parkinson are both on the davids team when is the first broadcast?
SELECT "First broadcast" FROM table_26160 WHERE "Davids team" = 'David O''Doherty and Katherine Parkinson'
SELECT "First broadcast" FROM "table_26160" WHERE "Davids team" = 'David O\'Doherty and Katherine Parkinson'