Some good news, 2 weeks after stripping 14 tomato plants of green toms following blight, and after losing half since picking them after subsequently developing the rot, over the last 3 days, most of them have suddenly ripened!
These have been full size and green for 2 months both on plant and off, but by removing diseased ones daily and leaving outside in a sunny spot in the garden, I've rescued half of them and that was many more than I expected. Lessons learned...