Even by the standards of the Old Testament, Noah is a thinly characterised individual. He is a man of deep faith; he is 500 years old; and he has three sons. Plenty of scope there for a television playwright creating a modern version of the story. Or so you might have thought. In The Ark (30 March), though, the veteran soap writer Tony Jordan decided to give Noah (David Threlfall) an extra son. Kenan (Nico Mirallegro), sporting a mild Liverpudlian accent, was younger than Ham, Shem and Japheth and displayed a marked rebellious streak. Taken by his father to the dangerous and immoral city on the plain below the homestead, he found he rather liked it or, to be more precise, he liked one of the girls who lived there.The stage was set, then, for a deep personal crisis for Noah when the city a