CREATE TABLE table_5824 ("Year" FLOAT, "Title" TEXT, "Role" TEXT, "Director" TEXT, "Notes" TEXT)

Notes of bbc radio 4, and a Director of peter kavanagh includes which average year?
SELECT AVG("Year") FROM table_5824 WHERE "Notes" = 'bbc radio 4' AND "Director" = 'peter kavanagh'
SELECT AVG("Year") FROM "table_5824" WHERE "Director" = 'peter kavanagh' AND "Notes" = 'bbc radio 4'