What do you think has happened here?

[FoolishWise Guy]

Too much nutrient or heat stress has been red hot in england

 

[Tomuk17]

Heat stress I think, what light are you using

 

[Sueet]

Definitely too much heat, but also I think maybe too little nutrient. They look very hungry to me, or maybe it is the light, hard to tell.

 

[Bill284]

Too much nutrient or heat stress has been red hot in england

Hello @FoolishWise Guy great garden, sorry your having issues.
Better quality light pics might be helpful to my old eyes.
It looks like like the plants i had mites on.
Could be a pest issue.
But you might have a heat issue in combination.
What are your temps?
How is your air circulation?
Does it seem to start at the top of the ladies or effect the plants more evenly.
On a different note did you watch Lewis yesterday
Give us you grow details so we can assess better.
Bill

 

[Nunyabiz]

Looks quite a bit like Russet mites.
And heat stress

 

[FoolishWise Guy]

Thanks guys il.see what I can doo

 

[Stev3]

Looks like Mite damage