Assuming 230 volts for UK sockets drawing 1 amp of current, the wattage draw is 230 watts. Assuming this was done for 15 minutes (typically enough for me to get

Assuming 230 volts for UK sockets drawing 1 amp of current, the wattage draw is 230 watts. Assuming this was done for 15 minutes (typically enough for me to get up a few percentage points to make a call or two), this represents 57.5 watt-hours. At 12 cents US per kWh, this comes out to $0.0069 total money stolen from municipal sources. It's literally a more serious offense to take a penny without leaving a penny.