Another tomatoe question

my tomatoes were going really well plenty of trusses and tomatoes, but the bottoms of the tomatoes have gone black. I have been watering every day and have them in large plastic bins, it has been hot in greenhouse and I have left door open during the day what has gone wrong will I lose them all?

 

Sounds like blossom end rot, here's a picture:

http://www.growfruitandveg.co.uk/grapevine/vegging-out/tomato-problems_20282.html#post256700

Are there drainage holes in the bottom of the plastic bins? Blossom end rot is normal only associated with container grow Toms and is usually a sign of erratic watering, but if the weather has been cold and the plants have had too much water I think that could have the same effect.

Does any of that fit the bill?

 

yes they look like that should I pull them off and hope others will be better

 

Yes, later ones will be fine (but the watering needs to be sorted out!)