You don't want heating issues just as it turns cold. Our original boiler got condemned on a service in winter. Could use the immersion for water at least. Best to get it checked in warmer times.
We have a Nest and other half doesn't fully trust it. I think it does okay really and it's not had connection issues. She comes in and says the house is cold, but that could be due to her still being cold.
I love being able to tell Google to "Turn the temperature to twenty-one degrees." it reinforces my lazy git persona.
I replaced our boiler and six radiators about six years ago.
Comming in and saying it's cold My missus does that! Or gets out a nice warm bed and says: "It's hot in here!" 😱