A while ago js.b1 asked about using a Pegler ¼ turn valve for a washing machine inlet hose. Having had numerous failures of the conventional type -- including one where the handle broke to a sharp point and penetrated my thumb, and another that broke when a lodger turned it in such a way that the valve didn't turn all the way off but the handle looked like it had and in addition leaked out of the gland, I decided I'd had enough of them.
Here's a picture of the new arrangement: . The fitting at the top is a Flowflex 15mm compression to ¾? male coupler (Screwfix quote number 82086). I don't suppose the brand matters, but it was the only one I could find from somewhere that had all the other bits I wanted to order at that point, so I thought it worth posting here in case anyone else wants to repeat the arrangement.
Overkill, perhaps, but at least it's easy to turn!