Just to add. The 1 bed 'granny flat' was converted and has a 'warm roof' with kingspan insulation, new double glazed windows, sheeps wool IWI, limecrete insulated floor with wet UFH running off a gas condensing combi boiler with individual zones in the bedroom, hall, livingroom and bathroom with individual heating controls.

The lighting is all LED and the TV and white goods are all new and were chosen for their low power ratings.

The main house is in the process of having similar IWI, insulation, ect. fitted but it's a slow and expensive business - hence why I'm concentrating on our electricity bills at present - though I would be interested to know how our current gas usage matches up before we upgrade our thermal elements.

Over the past 4 weeks my average electric has been 6.9 kWh/day and oil at 32.9 kWh/day.

This is for 2 adults in a 1,300 sq ft detached 4 bedroom chalet built 1989, with ongoing mods to insulation and systems - although critically, still heated via the original 23 year old boiler (replacement imminent).

Typical domestic energy consumption figures
http://www.ofgem.gov.uk/Media/FactSheets/Documents1/domestic%20energy%20consump%20fig%20FS.pdf
2011 medium consumption figure
gas 16500kwh
electric 3300kwh

1) draught proof, 2) air seal 3) insulate, 4) ?

May be 2)

Posted By: Pile-o-StoneI'm therefore struggling to think of other ways we could reduce our electricity consumption

Do a power audit. Pick up a little plug-in power meter such as a Kill-A-Watt, make sure it's one that can read accurately down <10W, some can't. Figure out what everything is using on standby and as part of it's regular duty cycle. It sounds like you might be mostly targeting standby losses. Arm yourself with data and the opportunities will make themselves obvious.

Some appliances are surprising, I found out that my toaster uses more on standby in a year than it does making toast! A lot of stuff can be put on timers so that it switches off at the wall automatically overnight, you can save a third of your standby losses without any inconvenience or retraining of fellow occupants! This could be several hundred kWh.

Places like the EON shop:

https://www.eonshop.co.uk/ShowProducts.aspx?Category=PowerSavingAppliances#

do heavily subsidised energy saving gizmos (along with some nonsense such as the "eco kettles"), you don't need to be an EON customer. Ikea also do perfectly good timer switches for about £2. There's tons you can do, maybe put some lighting on motion sensors? Apply extra insulation to fridges & freezers? An hour in the stocks with rotten tomatoes for leaving things switched on? Or apply the carrot rather than the stick? Gamify energy saving, could be popular with the kids?

Desktop computers ? I mean are they on most of the day or left on overnight doing backups?

As you can see from many of the comments above, the place to concentrate is on electricity usage and hot water. We have got to the point where improving the thermal efficiency of the building fabric has little effect in the whole scheme of things. We insulate walls, roofs and floors so well that adding to it makes little difference to the heat losses. Modern houses now lose far more heat through infiltration / ventilation. BUt heating water from 10C to 55C takes a lot of energy, and electricity costs a fortune. We all love our PCs, phone chargers, alarms, TV's and game consoles - look at finding a way to get the kids to TURN STUFF OFF!!!!