Tomato Leaf Curl

we are having problems with leaf curl on new top growth had a similar issue last year then we cut off affected growth plants then grew back strong  have tried that this year but new growth now curling and drying aswell tomatoes are in buckets in greenhouse about half homemade compost and half manure this has served us well in the past   can anyone suggest an answer to this problem apart from scrapping all plants they have lots of flowers lower down  thanks in advance.