Question: how much electricity does leaving things on standby use?
Answer: New item. So if an item left on standby uses 1 watt an hour (i.e. it is brand new and adheres to the new 1 watt legislation), then it uses 1kWh for every 1000 hours it is on. There are 8760 hours in a year, so it will use 8.76kWh in a year.