[DD.]

It's an all female, so no worries about pollination.

My cues have only just been sown & will be going into the unheated greenhouse next month.

[snails2go]

Thanks DD...only a month to go before we can see the garden through the patio doors then 

[A Reyt Tayty]

STOP THAT SCREAMING NOW, for heaven's sake!   
I let them absorb what water they want for an hour, say - and then take them out.

Done as you advise, but they do seem to be very waterlogged.

[mumofstig]

the excess soon drains away when you take them out. Don't soak them again till the compost feels dry when you push your finger in a little 

[A Reyt Tayty]

Cukes up in 5 days! Will they stay with me this time?

[mumofstig]

Who knows    :blink:

[DD.]

My crystal ball is not working either. 

[A Reyt Tayty]

Update:
The cukes look very fit indeed. They are in clear 1/2 pint plastic cups, and I can see the roots going to almost the very bottom of the cup.
Now the question: watering. I reckon if I just water a little from the bottom, the plant should get enough but leave the topsoil around the plant relatively drier? Or should I water it until it will soak up no more, then let it drain?

Another interesting observation. Instead of foil behind them, I used some very white paper. The plants tend to lean a little to the paper, rather than the "real" light.