Don't most washers and dryers have timed start like dishwashers do? I always remember mine having pictures like that but maybe that's just not a common thing
They turn over and blow cold air periodically to prevent them getting stinky.
As opposed to having your clothes be in a wet clump for hours? Between the two choices I'd prefer it being dry, because I know at least there will be less microbial activity.
30p/kWh in the day, 12p/kWh at night.
Dry an entire load for less than the cost of a Day Rate kWh, simply by pressing the "delay" button a few times.
It’s not common to have separate units here though. Much easier to setup a wash/dry cycle timer.