Okay. I give in. I have scoured the Internet and drawn a blank. When I was growing up we had a shower spray thing that went over the bath taps with super flexible connectors.
Now, all of the ones I can find are a) super rigid rubber and b) only seem to fit round taps. And teeny tiny round taps at that. Even the American ones. (Not that I'm saying everything in America is larger than life or anything.)
Anyway. We have square bath and basin taps. They're not that big, but they're "just" too big for the connectors on every shower spray we've tried. I even tried buying a cheap one and cutting the rubber to see if that would work (if it had we'd have bought a more durable one). It didn't. Aforesaid shower spray head has now been repurposed into a plant watering thingie.
Can anyone help with suggestions? I'm going demented with the amount of water we end up wasting when we could be using so much less! (Installing a shower is not an option at the moment. Though come summer a solar shower in the garden might be the way to go...)