[Anton]

My fellow gardener has asked me to upload a picture of his sad looking tomatoes. It's mildew isn't it? If so I don't supposed there is anything to be done about it is there?

Anton

[Ice]

That's blossom end rot caused by a calcium deficiency or sporadic watering.  Not fatal, just needs a change of watering regime.

[PAULW]

That looks like blight, the plant is going black and collapsing, every body on our lottie has the same thing I even have a touch in the greenhouse.
Yes sorry thats it for this year nothing you can do maybe it will be better next

[DD.]

Not blight. I agree with Ice.

If it was blight it wouldn't just be at the blossom end of the fruit.

http://www.rhs.org.uk/Advice/profiles0701/blossom_end_rot.asp

[penance]

Yep, also agree with Ice. Doesn't look like blight but sure looks like blossom end rot.

[Anton]

OK, thanks a lot I will convey your mixed blessings to my fellow gardener.

Anton

[yorky]

The two green ones nearest to the camera could just posssibly be blight. Agree with everyone else about the rest, definatley blossom end rot.