Yes when you open them up there are cavities in the stem, another symptom. I am pretty sure now it is canker as the one symptom I didnt have which was distinctive splash marks on the fruit skins, (they start white then turn to brown in the middle with white ring around edge), they now fit the picture perfectly for canker...I have done as my book suggested and sprayed with copper, I hate spraying but my tomato season will have lasted all of a fortnight if I lose them all now, that is way way too short.
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