One thing I have to say in praise of M&S - at least so much of their stuff is not just machine washable, but tumble-dryable, including pure linen.
I don't often tumble dry nowadays but recently, needing to dry some of Dh's cool weather shirts in a hurry, it was the non M&S ones that said Do Not Tumble Dry.
Colleague of mine once bought a white linen skirt from Gap. It said Dry Clean Only, which is surely daft for anything white. She hand washed it - and it shrank! It wasn't cheap, either. I machine wash (and occasionally tumble dry) all my M&S summer linen, shirts and trousers. Their summer linen is one area where ghastly colours and tacky 'bits' don't seem to have encroached.
BBC Radio 4Extra Scheduling Shake-Up.