What kind of Free or pay has Years of 2006– and a Provider of bt tv (formerly bt vision)?
CREATE TABLE "current_providers" (
  "provider" text,
  "years" text,
  "free_or_pay" text,
  "transmission" text,
  "on_demand" text
);
SELECT "free_or_pay" FROM "current_providers" WHERE "years"='2006–' AND "provider"='bt tv (formerly bt vision)';