That does seem high to me. Are they actual meter readings? If they're estimates, send in actual readings and hopefully it will go down.
Our recent bill was £261 for electric for 27/02/2023 to 19/05/2023 so nearly 3 months. There are only 2 of us, but DH WFH full time.
I did buy an Air Fryer before Christmas, so this is the first full quarter of using that. The main oven gets used once or twice a week at the most now. We don't have a tumble dryer either but do use the dishwasher 3/4 times a week and the washing machine 1/2 times.
We used 696 kWh in that 3 month period. How much actual electric did you use in that period?
Do you have gas for heating and hot water or are you fully electric? What was your gas usage during that time? Ours was 3,545 kWh and £375. DH does not like a cold house, so the heating is on for more and for longer than it would be if it was down to me.
Check the Water distiller to see what wattage it is. You can work out how much of the bill that is.
Also, check your other main appliances - do you have anything that's particularly old that might not be very efficient. I'm sure a 15 year old washing machine, for example, would be less energy efficient than a new one.