Hi, Peanuts can you give a photo of the yellow spots? Are they rounded or patchy? I've always associated yellow spot with leaf virus - not much can be done if it's prolific. Lift plants and burn
However, you could try the advice given by nutcutlet and verdun, also cut off yellowed leaves. Hope this helps.
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Bumping for peanuts....
Hi, Peanuts
can you give a photo of the yellow spots? Are they rounded or patchy? I've always associated yellow spot with leaf virus - not much can be done if it's prolific. Lift plants and burn 
However, you could try the advice given by nutcutlet and verdun, also cut off yellowed leaves. Hope this helps.