I have a Nest Thermostat and live in the UK. I have a radiator based heating system.
When I leave the house, some time later the Nest realises this and sets my house to Away. From this point onwards the thermostat does not obey any of my schedules. I have a schedule set to change the temperature at 5pm, but the nest ignores this because I don't arrive home until 5:30pm. At this point the house is cold.
I know that I can set the Nest to Home manually before I start my Journey, but is there any way to automatically have the Nest warm my home prior to arrival without disabling the Home/Away Assist or manually intervening?