One of the nice things about spring, if you’re lucky enough to have a garden, is that you can start hanging out the washing again. And the cost benefits of the washing line are even greater this year, as the war in Iran is pushing up the price of tumble-drying – along with just about everything else. At current electricity prices, traditional tumble dryers currently cost an average of £130 a year to run, based on a typical household washing thre…