I don’t have exact figures but any newish appliance should have a minimal power draw on standby. Choosing a television completely at random, this set uses 0.5w on standby or 2w on “networked standby” (connected to the WiFi I assume).
This is 0.01p/0.05p per hour at the moment. In other words having 20 TVs on networked standby would be 1p per hour. While it does all add up, as you admit it’s causing you stress you have to ask is it worth it when you might be saving a couple of pounds a month? You might conclude it is, but if you could cut down on a few minutes’ electric shower use a day, a couple of tumble dries or oven use it might be far less painful and save a lot more money.