Tomatoes before blight

we only grow toms in the greenhouse , but still buy 'blight resistent' seeds.
outdoor plants are at risk from this disease. dont compost the old plants , and grow new plants in a different posistion next year . you can spray when blight attacks ,but never had this , so unable to offer advice on what spray to use.
hope you managed to harvest some toms before blight took hold!!!......steve