How to tell botrytis from blight?

There's something very wrong with my tomatoes, but looking at the pictures on the net I still cannot tell if it's blight or botrytis. I have dark blotches on leaves and stems, and a couple of tomatoes seem affected too. It's started on the lower part of one plant, and it's now spreading up and to the nearby plants. At the beginning, the leaves have several patches, usually central but sometimes at the border; then they get black and shrivel. I looked on the underside of some affected leaves, and on some of them there is some sort of powder/mould.
I'll try to take some pictures, but if you guys have any advice it would be great. Also, if it's likely to be blight, should I report it to somebody?
I'm gutted, this year I've just managed to make a couple of tomato salads, and the plants are laden with green tomatoes..

If the green tomatoes are unaffected, take them off and use them to make green tomato chutney, very nice.

Is it safe to eat blighted tomatoes then?

I think we have the same problem, are you just going to chop off the brown bits and make your chutney?

I think I can see a slight orangey hue coming to some of our fruits so have been hanging in there for a while in the hope they'll eventually go red, but the brown bits seem to be getting to them quicker than they're changing from green to red..

We need to take action soon I guess.  I wonder if there are many more recipes with green tomatoes?? 

We had blight on the allotment - despite there being no reported outbreaks in the area on "blightwatch" and luckily we managed to salvage many kg of unaffected green fruit and just put them en masse on sunny windowsills till they riped, turning them every few days or so; though we lost some of the ones but it was not as devastating as originally thought.

But I do feel for the chap on the neighbouring plot who ignored the "warnings" several of us gave at the time about blight, esp after local work colleagues mentioned blight had hit them some time earlier. But no, the neighbour maintained that if it says nothing on blightwatch then nothing it will be....such a shame that all his once impressive and inspiring tomato plants with their multitude of stunning green fruit have all been decimated.

of course we did!

Annoying that others locally failed to.  I casually spoke to over a dozen people on the allotment and only 3 of them knew about the website. Hardly inspires confidence. But then I can hardly blame them and I wonder precisely how many people who get blight know about the website and know what to do - or even attach much importance to it. After all, it is not perceived as life-threatening: merely an irritant for the average gardener ie) joe public.

Did the blight affect potatoes as well as tomatoes on your site?