~4100 day, ~2100 night over last 12 months according to recent bill.
e7 storage heaters, no gas, immersion using last ~1 hour of e7 in the early hours of morning.
Two of us, six fish tanks but only one has significant lighting (~200W iirc) ~6 hours per day, only the garage tank has a 300W heater set to trigger on if temp drops below 18C for sub-tropical livebearers. Washing machine cold water feed only, usually set to do 20C washes.
8000 sounds high to be honest, as we both work part time and someone is home during the daytime most days (so pc/tv on, regular kettle boils etc.).
If you have storage heaters, check they are not consuming electricity outside e7 hours. After years in our rented place we discovered ours do if the input is not on minimum and it explained some horendous winter bills we’ve had, I now turn any heaters to min before I head off to work or on days off just before 0730 if I remember, turned on just before bed when needed so ~2 hours of “daytime” rate there.