According to the RHS website “Tomato blight is a disease that attacks the foliage and fruit of tomatoes, causing rotting. It is most common in warm, wet weather, causing collapse and decay”.
I think that some of my tomato plants have suffered with blight. I have three different varieties in GH2 and it is “the wonky ones” that have been affected thus far. The other varieties (Gardener's Delight and A N OTHER) are healthy and ripening in abundance – and taste marvellously sweet and succulently earthy.