Due to storm Kristen a few weeks ago I've still got a very limited electric supply so, in desperation and with huge reluctance, I washed my manky bedding on a cold wash (the's not enough current to heat the water) on 'it's got to be better than nothing' basis.
Wow, wow, wow. They came out exactly the same as if they'd been washed at 40c or 60c. Who knew? And why didn't they tell me?