First he was not guilty. Then, on the eve of his trial, Kevin DaCosta Cadogan, the bank teller who flattened a pensioner’s account, pleaded guilty to putting a hit out on her. But when he reappeared last Friday, Cadogan’s statement to the court seemed to suggest he did not know his convicted co-conspirator Kirk St Clair White had hired the hitman to kill the woman. As a result, his guilty …