Also interestingly (at least to me) I did some calculations based on our washing machine, tumble dryer and dishwasher. I was thinking of line drying stuff to save ££. Turns out it wouldn't help much.....
We have a heat pump tumble dryer, which (based on the manufacturers info, which I appreciate may not be entirely accurate) it costs us 31p per cycle (was 22p pre today's price rise). So if we used it 5 times/week, every week of the year, it cost a total of £79.53. So yes it would save money not to use it, but then I'd have to factor in re-washing sometimes when a bird poos on the washing (we have a lot of trees) so I wasn't sure it was really worth it.
For comparison the washing m/c was 34p per cycle (it's a 10+ year old machine) and the dishwasher 26p per cycle.
I based my calcs on 5 machine washes & dries, and 10 dishwashes/week and overall it cost £304/year on the new prices from today.
I was disappointed that line drying wasn't the answer I was looking for! Some saving yes, but not as much as I was hoping for.
Of course these are based on whatever the most efficient cycle is, for the manufacturer to base their stats on, but might be helpful to people.