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in Fruit & veg
Hi Lauren - I've downloaded your pic and included it below so it can be seen more easily - hope that's OK.
It might be a bacterial leaf spot. This page is pretty good for ID etc:
I was about to post the same. Healthy plants of 2 varieties in expensive compost and yet browny rust spots! Never seen it before, mine are inside a green plastic greenhouse and I have the door open! It's worrying me, not sure what to do!!!
Regardless of which disease is present, I have found the best way to deal with tomato leaf problems is to remove any affected leaves and burn them or throw them in the household rubbish bin - never put them in a compost bin. I've even managed to keep plants affected with late blight going this way, although they did look very, very sorry for themselves!
I usually end up with some degree of leaf trouble on toms so I do as already suggested remove the leaf. Doesn't seem to have any impact on actual tomatoes. I would have a look under the leaf as sometimes the problem is aphids, there seems to be a lot around just now.
Looks like Early Blight to me. As above, you can only pick off the affected leaves as soon as the very first signs emerge. The longer you leave it, the more you risk denuding your plant.
Spraying is only an option if you spray preventively - before symptoms appear. Once the symptoms appear, no spray will cure the problem.
why not sign up to Blightwatch?
I read something on RHS website that it to do with extremes of temperature between the night and daytime which would certainly make sense.