IN many respects, Agatha Christie was 45 years before her time with “And Then There Were None”, albeit with its now politically incorrect original title. Just as with the plethora of contemporary talent shows, the audience watches avidly as a group of unknowns get whittled down, one by one, by unseen hands until the last (the most talented?) remains. As ‘The Ten’ are reduced in number to ‘The Final Three’, one is left wondering how those left cope with the rising pressure.