In a letter to S4C chairman Huw Jones, Lord Patten called for a management structure at S4C that "balances the principles of partnership with independence for the S4C service".
Lord Hall must also tackle a management culture described by the chairman of the BBC Trust Lord Patten as "dysfunctional" and "chaotic" in evidence to the Pollard Review of the Savile affair.
Though he was "saying all the right things" about reforming management in the first 11 days of his 54-day reign, Patten said things began to unravel once the Savile scandal erupted.