thanks for your optimism charles 
yes the lettuce, and the endive which was next to it on the shelf in the tunnel are in modules, i wonder if should let the lettuce try and recover in the modules, or just get it in the ground?
What is interesting is that the bubikpof, lattughino and meraviglia are all slightly affected by the mildew, but it is not concerning , they look ok – however the grenoble has taken a big hit, i will take a photo tomorrow and send to you.
So i’m wondering if the grenoble red seed (seeds of italy) is from a plant of weak constitution..?
As for watering – i have been aware and thinking of that – and indeed i haven’t watered them for a good few days
but earlier in the month i found it extremely challenging for seedlings – when the sun was out, the heat was so intense i has to water 3 or 4 times a day to avoid wilting. Also several seedlings were simply frazzled! this was much worse than in the summer heat of this year..
And as i was pricking out the lettuce during this sept hot spell, i was generous with the water – and perhaps too generous!
In fact even today when the sun came out – i had a few wiltings even after a light watering..
quite a challenging time for gardening i’m finding!