This was indeed a feature added some updates ago, but I'm not sure the UK has any rapid chargers added to this list. My guess is, if you can see the charger naxt to the superchargers when you filter the chargers in the map view by 3 lightning bolts, it will work.
Another way to warm up the battery is to preheat the car without anyone inside before departure. Not only it warms the cabin but also stalls the motor(s) and uses that heat to warm up the battery.