I think it may just be the cold, then the heat

I,d wait and see....you could separate the affected ones if it worries you.
I doubt that those leaves will change but hope that the new growth is normal

I think Pam is right about the temperature. I have grown G's D toms in a cold greenhouse for years - I have often noticed discoloured leaves, especially when the plants are small. I should wait and see as Pam advises. Chances are they'll settle down and the new growth will be fine.

Thank you Pamg and Melchisedec. I will certainly take your advice. I have had them outside today as it is lovely and warm and I hoped the weather would cheer them up. I have even been thinking of planting new seeds, but I guess it is a bit late for that!

they do turn 'blue' with the cold so I wouldn't worry about them . It is a bit late to start new ones off.

Tomatoes stop growing if the temp falls below 50 deg f, and if it gets down to about 45 the leaves start to discolour, as Sbg says 'blue with cold', they really need a bit of heat until later in the year, when the nights are not so cold, Derek.

Mine have been ok this year, what I do if concerned is construct a "warm area" in the gh for them, cardboard boxes or in my case offcuts of twinwall poly carbonate and put them in that and cover with bubble plastic, then if the weather is awful just remove one or two of the sides and top in the day, they need the light or will go leggy, if its sunny days and cold nights remove all sides in the day and put all back at night. Fiddly but its just for this delicate period.
Even when in the grobags if its really awful I,ve been known to construct "walls" at night to keep them warm

I've got Alicante seedlings, and in a burst of optimism, brought them out into the sunshine. Since then temperatures have plummetted to a daytime low of 6° and they, too, have gone a rather fetching shade of purple. They are back in the greenhouse now, waiting for a bit of warmth.

Oh Gattina, thats a shame, we have had a lovely two days, bright today but the breeze is cool......we may get low temps and rain from tomorrow. :0(

Today we have nearly warm sunshine, Pam, but the forecast suggests it isn't going to last. There are times when we wonder exactly why we moved here.......It seems Manchester might have been a better bet!

Hope you enjoyed the sun whilevyou have it Gattina, They still get a lot of rain in manchester........east anglia looks good but then they suffer lack of rain! You can't win.......

It's raining right now, but due to stop shortly, then we have a predicted peak of 12°c round about midday, when there should be a gleam of sunshine, then back to 10 more days of rain. It's all fun, fun, fun here. We're driven to thoughts of daytime t.v.!