Thanks for the advice bonbon. I'll give that a go today and post an update soon.
As you may have worked out by now, I have recently bought a new digital camera, hence all the pics attached! I'm gonna attach the last two now, as I hope they may serve other growers in future. They're of another plant which hasn't got the curled leave problem but the middle fan leaves are starting to discolour. I'll give these the same treatment as the sick one as I'm sure they'll all be lacking the same thing!
mrrichiet Reviewed by mrrichiet on . Diagnosis required Hi, the attached pics are of a plant about 10 days under 12/12. 3/4 are looking fine but this one seems to be lacking something. It's new growth is yellower than the other plants and the lower fan leaves are deteriorating quicker. The other fan leaves are now notably curled. From what I read this could be N deficiency, although I have given it some, but I also see it could be a zinc deficiency. However, perhaps as it's flowerings, it's crying out for P & K. Can anyone help pin this down? Rating: 5