Flowers and ... blight?

Things are proceeding as normal. Especially in this hot weather that we're currently experiencing. I would say "enjoying" but I'm not. But parts of the allotment are.

The Buddleja is liking it immensely and has started putting out a mass of flowers.

However I fear that there may be problems ahead. One of my Potato plants is showing worrying signs possibly of blight.

Even so I decided that it would be better to harvest it now rather than risk it.

Not too bad a crop for a small pot. But I worry about the rest of them. So far they all look green and healthy. But if it is blight then it can spread fast.