We're having it on twice a week now when the mother in law is round, although it's above 10C it feels colder with the wind. According to the smart meter it is costing us £2 to have it on for about 90 mins.
Rest of the time it's blankets and dressing gowns or out of the house doing something else.
Electric is varying wildly. A day when we do 3 loads of washing and have the tumble dryer on is up towards £7 per day, yesterday with two of us working from home and cooking for an hour, £2. For comparison the latter used to cost us about £1.50 a day, so the jump in cost when we have to wash the kids school uniforms etc seems disproportionate. I'll be on the British Gas website layer checking our usage figs.
Good reminder for anyone with a dryer, clean it out properly etc to ensure its efficient and can dry clothes faster.