The big ticket electric users in this house are:
The dishwasher (so it'll be jammed full before going on the eco setting only). Crumbed dishes etc can get washed by hand in cool water.
The oven (so it'll be batch cooking so that it's never on just for one thing).
The washing machine (so clothes will be worn more before ashing and washes will be split into cool/quick wash for lightly soiled and only use the hotter washes when needed, for bedlinens etc)
The freezers (this is difficult as we have an allotment to use both freezers to stock up on produce. However, any spare spaces will be filled with cold water bottles to keep temps low when the door is opened; stock monitored and if it drops low enough for just one freezer we'll turn on off)
Fridge (trick one that)
Kettle (only boil what you need)
Tumble dryer (is banned)
From there on down the list, it's more about timer plugs or even taking some things out of action totally. E.g. we have a sound bar on the main telly. That is getting unplugged and we'll use the TV speakers instead.
For gas it's....
Shorter, cooler showers
No baths
Heating on low in morning and evening only.
Thermal curtains over the patio doors
Internal doors will be closed with draught exclusers and we'll not heat the hallways or landing. That way we keep any heat in the rooms we're sitting in most.
External doors will have draught exclusers.
Blankets, electric blankets, thermals, slippers.