Quote Originally Posted by hibsbollah View Post
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Its not blight or canker or any of the nasty ones, not fungal. Doesnt look like a major problem, wont affect your plants ability to photosynthesise or form fruit trusses.
Thanks, I was hoping someone would say something like that. I'll keep an eye on it and if it gets worse I'll cut back the affected leaves (it's only appearing on a few at the moment).

To add a tip, if you get blossom end rot (blackening and eventual rotting at the bottom of the fruit) as I did last year, it's usually due to the plant not picking up enough calcium. Crushed eggshells tend to take too long to release their calcium, but crushed up Rennies (or other indigestion tablets) are a good quick fix. You should remove the affected tomatoes though as they won't heal.