Cucumber about to die on me?

Oh no! I moved my cucumber into the greenhouse last week, planted in a growbag, it was doing fine then today when i looked it was wilting badly.  Thought the compost might be too cold or wet so I,v repotted it into a smaller pot and put it in a mini plastic greenhouse within the main greenhouse but after a few hours it looks worse What to do?  Is it doomed?  The middle looks OK but the big outer leaves are really droopy Help!!!!

I have had this problem with my young plants on hot days in the greenhouse, after removing them to some cooler shade they have recovered quite quickly.
Good luck

My 2 are in intensive care after being left overnight in the greenhouse (even though the overnight temperatures were higher than they are now.)

Seed leaves curled up at the edges but luckily they had their first true leaves which are looking a bit healthier now that they've been living in my kitchen for a week!

They are F1 Passandra and at £3.50 for 6 seeds the miserable blighters are going to live!! (even if it kills me!) 

Sue: Yours might recover if given the best possible care (warm temperature and as consistent as possible) but I have to say it sounds a bit too far gone to me.