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Recent mention of the insidious drains on stored power reminds me that I haven't scrutinised our use recently either.
Apart from switching off lights when a room is not occupied and not leaving many devices on standby we don't really do much to drive down use, which is 5.8 +/- 0.5 kWhr/day across the year - and has crept up from 5.1 in 2014.

Time to do a re-evaluation. I suspect that every new wireless router that we get consumes more power than the predecessor as the current BTHub6 always feels quite warm. They advertise ever-better reach, which I assume means more power consumed.

I have a plug-and-socket meter that I bought from the old place, but to measure lots of things like the kitchen heat-recovering extract fan would mean breaking into the circuit and putting in a temporary plug and socket. Anyone know of better non-contact ways to do it? Is there a meter which will clip round a twin-and-earth cable?

I have no idea how much power the central heating controller / programmable thermostat / solar tubes controller and associated pumps take, for example.
We might run down our stock of frozen soft fruit and switch off the small chest freezer as one action. I have read that digital radios use more than analogue ones, so one gets left in a room where it is hardly ever used and only switched on and reprogrammed when there is a particular need. The other is my bedside radio, so maybe I ought to be looking at swapping that one out.

Any other suggestions for culprits or monitoring methods?
A

Fridge freezers. My old one took 20W even when the compressor wasn't running -and it seemed to run ~75% of the time! I reckon this was a big chunk of my background energy use. The new one will probably pay for itself in 4 years - and that's with free electricity during most days from my solar panels!

You can't get a reading by clipping a meter around a twin and earth cable - you'd need to clip it just round the live (or neutral) so that's a bit invasive. I had a smart meter fitted a few months ago and the real-time display (30sec. update) is very useful for these sorts of investigations.

I'd suggest an old fridge/freezer as the first place to look. You can swap the broadband provider's router for your own. The proliferation of devices from a few tens to hundreds makes this process a lot more difficult!

At our house old fridges and freeers were culprits although the main culprit turned out to be a Yamaha soundbar. Traced them all through a plug in line meter. Beyond that I'd maybe shut down circuits at the CU having ran extension reels to critical gear first from other circuits.

My aquarium and its various pumps/heaters uses a surprising amount of power. Not much I can do about it except control the time when the heaters are on to coincide with cheap rate power and the hope of solar.