Generate 1W load on 240V mains to calibrate power meter
If you can verify the power consumption with your power analyzer you don't really need a precise 1W load, right?
Just use a (240V rated) 52.9k resistor that will give you approximatly 1W at you oulet. Then measure simultaneously with your power meter and your power analyzer and compare.
But I think a warning at this stage is obligatory: If you don't know much about electronics, be very careful when working with mains voltage. Better ask someone with some professional training to assist.