Poorly tomato plant
I was sent this picture from my brother who lives in Bulgaria asking what's up with his tomatoes today. I think there's a few problems going on here including the leaf curl which is probably down to the unseasonable wet and cold weather most of Central Europe has been suffering with this year. The brown spots on the leaves are a worry though and the yellowing, I've suggested a magnesium deficiency but am hoping a more experienced eye might be able to shed some more light on the issues.
In short, what's up with it?