How do I read a Smart Meter (smets2) that is set for Economy 7

Just had smets2 smart meters installed. After a week waiting for Bulb to set it up for Economy 7 I now want to read the meter manually to check bills and for my own records but I am getting different readings on the meter to the IHD (higher). Is the IHD the total usage and the meter just the current tariffs total usage? i.e. Rate 1 total during the day. And is that monetary “so far today” include both Rates or just the current Rate?