Left light switch turns the socket on and off. It’s wired to the wrong bit of the switch. Also correlates with the switch rather than the light bulb as well due to the dual switch topology. Total nightmare to work that out I bet for Zucca
It's not that obvious because zucca's picture shows the switches wrong; a 3-way lighting switch is a SPDT toggle, so is ALWAYS making contact with one or the other point. What he has there is sortof a ON-OFF-ON SPDT. (either that, or the common symbol for a switch has evolved and I'm just an old fart who expects things to be "a certain way")
It is absolutely normal to have an outlet wired in parallel to an overhead light switch for a floor/table lamp. Most often over here they'll have it as one half of a duplex outlet, as med suggests. This arrangement however... if zucca has it right... means that in one position, the power to that outlet actually is in series with the overhead lamp. That would DEFINITELY have you
and
in short order.
Since color-coded outlets are a common thing nowadays... you'd think they'd develop a standard color code to denote switched outlets and the related switches and the same with 3-way switches. I've seen some strange ones; like the house I'm in now, which has the fan in the upstairs bathroom (instead of using a timer switch) 3-way wired to a switch downstairs next to the thermostat in the dining room.
Since they already have timer switches all over the place, the only reason I can think of for this instead of a timer is so that fan can be turned on from downstairs; maybe if "he" stinks up the joint and forgets to turn on the fan...?
mnem