Well, plugged in overnight, set to pre-heat using the Ohme App.
Went out at 6:30am, no pre-heating. Loaded the car and set off at -2c, none of the heated seats would work 🙁 luckily the steering wheel heater worked. Pulled over at a Greggs for a bun and hot drink, got back in and seats now working again.
Total round trip of 108 miles, 1.8 Miles/kWh on the way up, 2.6 miles/kWh on the return. For a 108 mile trip it used 58% of the battery.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!