I am struggling to give a manual meter reading from my old supplier smart meter. I don’t trust the readings
What don’t you trust about the values you’re seeing?
@Greenwood59, to be clear, are you reading from the IHD, or the displays on the meters themselves.
The IHD absolutely should not be trusted when switching suppliers - confirm with the displays on the meters themselves.
If you’re already reading from the meters themselves then I’d trust them - but (for a fee if they’re found to be working fine) you can get Bulb to install a check meter(s) to verify.