KevinD ###
"Automatically pre-select import slots for prices (in pence) below the threshold specified here. Slots meeting the price threshold criteria will be selected regardless of your Agile charge window From and To times. "
As you have discovered, this functionality doesn’t seem to be very useful. A price of, say, 5p is cheap if subsequent slots are, say, 20p. But if subsequent slots are, say, 2p or, as you found yesterday, negative then 5p is very expensive.
For the same reason, I don’t find the colour coding of slots according to fixed price points to be helpful. It would be more useful to show the cheapest 20% of slots in one colour, the next 20% in a different colour and so on.