I have just noticed that a few of my outdoor potted plants and developed brown/black marks on the leaves, almost like burn marks, have they out grown their pots or do they have some disease?
My clematis" Almandi" has been hit by the frosts from changeable weather pattern, so have quite a few things, I am in the SE to west of London. Turn the leaves over to check for infestation, but I would think it is frost scorching!