Anders Hultin, an architect of the Swedish government’s voucher system, says the Tories’ plan to emulate it will fail unless they encourage a new breed of education entrepreneursFor us Swedes, it is gratifying to see David Cameron put our free schools model at the heart of his reform agenda. He has chosen well. In a few short years, the voucher system has transformed education in Sweden and led to the creation of almost a thousand new schools. But the Conservative leader has failed to grasp a key aspect of their success. To flourish, these schools must be allowed to make a profit. This isn’t just one of a long list of pessimistic predictions — it’s the only crucial criticism; he can ignore the rest. The doubts I hear about school choice in England now are the same ones I heard when I helped draft the policy as an adviser in the Swedish education and science department in 1992.