Thanks to all who responded to my request for flow switches; I've followed up and got a couple of goos probables, Novomec EFS, and Gentech FS 01... etc
When I started this 18 months ago S/T were miles dearer than Grundfos, but now Grundfos are about 90 quid, and make the Stuart Turner look a bit more affordable.
But are they worth it? According to their website (very sparse) they do provide spares, so that's a plus.
If the monsoon single, or even the showermate single, is quiet and reliable, it could be worth investing in.
Any comments?
mike