Most modern appliances are required by law to consume very low levels of power when on standby. For example the One Watt initiative and then the half watt meant that devices used much less power than previously.
“Since 2013, the European Commission has ruled that TVs must not use more than half a watt of power while in standby mode2.
Testing by Which? in 2014 found that an LED HD TV left on standby for 19 hours would use 0.22 watts during that time. Assuming that was repeated for 365 days, your TV would use 80.3 watts over the course of the year while on standby. “
From
https://www.ovoenergy.com/guides/ene...standby-energy
Some older devices may of course still use power, as will games consoles or devices updating or downloading overnight (e.g. Sky Q boxes).