Is this electrical leqkage

Any transformers on devices like furnaces, etc. ? You should be able to track it down with the breakers.

greg

Fridge ? Freezer ? Central Heating ? Stuff with clocks on - cooker, microwave etc ? Sat receiver ? VCR ? DVD player ?

If you genuinely had 100 watts of leakage on your household mains wiring, I would treat that as cause for huge concern ...

Be aware also that although you believe your power meter to be accurate, they are mostly designed for reading nice symmetrical draws like you would get from a light bulb and so on. Many modern devices employ switchmode power supplies, and in standby mode, these often operate in a power saving 'burst' mode. Some cheap power meters can't cope with this highly asymmetric draw, and will give an erroneous reading. Also be aware that although shutting off equipment that has a standby mode seems like a good juice-saving plan, standby modes often mask important housekeeping tasks that need to go on in the background - keeping your Sky box updated, and keeping the modem live to comply with the terms of your contract, for instance, especially if you have Sky MultiRoom option.

Arfa

Doorbell transformers are on all the time (in the U.S.) and usually out of sight in the attic rafters somewhere.

And, if what you mean by "buy (sic) turning everything off" does not also include unplugging all the wall-warts that power the "off" things, then that's a power sink, too.

Motion-activated exterior lights?

Jonesy