So now it's all working well here is a quick review of the switch.
As background, I currently use Yagusmart Zigbee no neutral switches for most of my ceiling lights. They work OK, but I've had some stop responding over the few months I've had them and need re-paring so I'm not 100% committed to them and am always on the look out for other options.
As seen above, use the Generic Z-Wave Smart Switch driver for this switch.
The switch is currently only available as a single but I understand there are plans for a double but probably not until next year.
The switch looks neat and tidy with no visible screws, the frontplate is flat glass with a square touch area in the middle. The border of that is backlit by LED that is blue when off, and orangey yellow when on. I don't know if this is, or could be, configurable. The "turn on" indicator in the Smart Switch driver does not change it's behaviour.
It retains it's switch state following a power cut. It is not one of those annoying switches that comes on at 100% regardless of what state it was in before the outage.
On my system it is very fast to react. I have added it to a group with one of my existing Yagusmarts. This is switched on by motion and when that is triggered the Zwave switch actually comes marginally quicker than the Yagusmart Zigbee one. This is my only Zwave device though so this may not be representative.
It is a zwave repeater whereas the Yagusmarts are zigbee endpoints only.
If you want a Zwave no neutral UK format light switch, it is AFAIK the only one available.
It seems to need the (supplied) LED bypass connecting across the load to work correctly. I've tried up to a 12W LED and without the bypass the bulb just flashes on and off. The Yagusmarts work without a bypass using 9W LEDs.
At £49 it's a bit "spendy" even with an LED bypass included.
It protrudes 27 mm behind the back face of the front face (if that makes any sense!) The Yagusmarts are 24mm.
Edit. Update. I have discovered that 2 x 12W dimmable LEDs are enough to work OK without the bypass.