Er good try but the experiment in a Private NHS Hospital did not fail because the hospital was poor, it failed because demand was too high and there was not enough funds coming from Government to pay for it and make a profit.
Labour and the Unions may have sabotarged its rating (I do not know if that accusation is true), but that is not why Circle ended the deal. They ended the deal because they had to make a profit after they had treated patients, and couldn't do (or not enough profit to satisfy their shareholders).