If electricity gets any more expensive in the UK (it will), I might have to start hand washing clothes!
From what I understand, the dryer is a bigger concern. In the UK and in Europe, you are already ahead of the curve by reducing use of the electric dryer.
A heat pump dryer is 4x as efficient as a resistive electric dryer which would reduce your operating costs by 75%.
Any of these that are electric is where your money is going: heat, water heater, air con (if you have it), clothes dryer, oven. Switch them to Russian natural gas for the savings.
Your washing machine is likely an order of magnitude more efficient than you. A cycle in my machine consumes something like 0.2kWh.