I think Lesley that your link to the RHS tomato link shows a picture so exactly like my photo that it just has to be as you say magnesium deficiency I'll be out looking for the Epsom salts soon as I can.
Funny the yellow/gold spotting is on the lower leaves of the yellow Tumbling Tom in the grow bags whilst not on the ones in individual pots.
I have other tomatoes in grow bags as well, Marmande and F1 Incas that have the slight yellowing that are the same varieties as the ones with black spots in open veg plot, perhaps some grow bags need supplements as well.
They all are growing OK otherwise as far as I can tell and if they all produce I will have far too many, fortunately I do like tomatoes.
No trusses yet Malcolm.
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