At my late mother's house, I wanted to see what the boiler was doing, if it was modulating as it should, so asked for a gas smart meter, I was refused, told could not have one without having an electric smart meter.
My IHD from British Gas has never worked properly, they don't seem to be the most reliable things. Mine will show electricity consumption and cost correctly but for Gas it only shows consumption and not cost. Ringing British Gas didn't get it resolved. It is now in a drawer with other useless electronic crap.
Mine has says "Awaiting data, Please see system status" it has done since the day fitted, and unlikely to change, as we don't have gas in the town.
Like the silly info shown by the thermostat for the central heating.

What is the point, it shows the thermostat turned on for 15 minutes when I tested all worked on Friday, But being switch on does not mean the boiler was running, once hot water returns the boiler turns off. Also, in all 4 thermostats, so boiler can run without Nest calling for heat.
Now Wiser does give some useful info

and the same with the Kasa TRV head, but so many of these so-called smart devices give rather useless info. And I tried and failed to read the smart meter direct, there are so many windows

and I am sure pressing the buttons in the right order would tell me what is going on, but I want three readings, import peak, import off-peak, and export. What total Act Export is, I have not a clue, is that me exporting to the grid, or grid exporting to me? I can work out what the standing charge is, and read the time, but what is <IND> or Rea or <net> <sum> or Act. No instruction book came with it, so all I can do is read the app on the phone. Even that has stopped working, account in wife's named, and it has logged me out. Not a clue what the password is.