We've suffered from tomato blight for years.
Always made sure the damaged plants went in the council's re-cycling bin not our home compost bins, moved where they were grown, but nothing helped and blight seemed to get earlier every year.
This year we decided to grow less plants and keep them in our small glass greenhouse and even smaller plastic one. Tomatoes have grown bigger and better but when we went on holiday we removed the cover of the plastic greenhouse and they seem to have picked up the blight spores then. Even so, it's been the best year we've had for tomatoes in a long while.