After the novelty of reading my meters remotely wore off (about 1 week!) I put the IHD in a cupboard and forgot about it. I occasionally check my fuel usage via the BG web-site. I have no reason to suspect BG's readings are inaccurate.
My first meters were installed by (I think) OVO. OVO gave the option of monthly, weekly, or 30 minute data updates to their website, which all worked rather well to show what was consumed when. The entire batch of 30 minute data was uploaded as a batch soon after midnight, so could be 24 hours behind, but not the less useful. Even when meters have worked fully Smart with a supplier since then, I have not had a decent level of data.
With BE now and their usage app is pathetic, doesn't even show any electric usage, gas usage is just a single bar for the months consumption - so I'm bending their ear with complaints about none working Smarts and their useless consumption page
Never checked before but I'm with OVO and I see on the app that they give me my daily readings.
Yep, as said above - OVO is one of the more useful ones. I maintain my own spreadsheet of consumption of E,G and W - updated each Sunday. No particular reason other than I like to know and like playing with numbers and spreadsheets.