Sorry not the worst photo, will try again, am hopeless with computers!

Ok have posted (I hope) a couple of pics of worst offenders. Let me know what you all think. Many thanks!

Thanks everyone for taking the trouble to answer. Yes it is a yellow courgette that is the worst affected, perhaps I will sit it out and see what happens. Will post a photo later if I can. Thanks again.

Hello! this is my first post here. I have an allotment in mid Suffolk which I have worked for the last five years. I have cucumber leaf mosaic disease (?) on the leaves of all my courgette and squash plants, One of the older chaps on my allotment says that it is in the soil around the plants and if ...