Worrying about spots and black patches on tomato leaves

Looking at my tomato leaves today I saw some odd things on some leaves, the attached picture shows close ups of leaves from the same branch.

The inset picture shows what looks like black rot, this is over a picture of a leaf with black spots on it. To the right, another black rot at the top and at the bottom. Scale is the same on all pics.

Is this cause for concern? Someone at the allotment lost a lot of tomatoes to blight and a number of us were affected by potato blight so a bit worried. Thanks all