Blotchy leaves on tomatoes

 Just wondered if anyone could help me with my tomato plants.  They are still quite small (not in final planting pots/growbags) but some have started to develop brown edges on the leaves and what looks like purple discolouring on the underside of the leaves.  Can anyone tell me what the problem is.  Thanks

p.s. can anyone tell me why I can't upload a picture from my computer.


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