DD with Scottish Power is ~£100pcm, elec only including storage heater on Economy7 tarriff, will be looking around for deals over next month as deal coming to an end in 2020.
Immersion heater set to come on during the last ~60mins of e7 "cheap" rate, but turned on before running baths after midday.
We have to manually turn storage heaters to minimum "charge up" when in use from around Nov-Mar, otherwise they will consume elec at expensive day rate, because they are not connected exclusively to the e7 ring.
Six fish tanks in use, but only garage one has active heater (300W) turned on Nov-Mar to maintain ~18C with plenty of insulation layers over tank, two indoor ones have lights for ~6 hour period per day (~250W total IIRC). I use cold water exclusively for water changes Mar-Oct, then use some hot water depending on cold water temp (by feel rather than thermometer). Filters use "peanuts" elec, approx 8-50W per tank.
1 PC as the R9 390 gfx and possible the Corsair 750W psu at least in mine died 2+ months ago, but I game far less than I used to and better half's PC is decent (i5 6600k, 16GB, RX 580) and so we "time-share" that with using Surface Pro 4 for browsing and Zwift.
I'm guilty of boiling the kettle for coffees most hours when I'm not working and until ~1600 everyday, but I try to only put enough water in for what I need.
Washing machine used on 20C setting more washes, has cold water feed only.
Edit: Forgot that most of our room bulbs are low Watt LEDs.