We also had terrible blight on tomatoes on our allotment - it seemed such a waste pulling them up and destroying them all before they reached their peak.
I did have blight-free tasty tomatoes from 'Elegance' which is a Shirley type tomato I tried for the first time this year. They were in the greenhouse though. I would grow these again
Tried Ferline before which does have some resistance but not my favourite for taste.
I think it is worth trying again but perhaps spreading the risk eg range of varieties outside and underglass.