Can anybody please please tell me how to get both my electric and gas usage to display? Indeed do they display meter readings at all. Help because bulb hasn’t.

The IHD purely interacts with the Smart Meter. If your Smart Meter is a SMETS1, it will not know your rate so cannot tell the IHD. If your smart meter is a SMETS2, it probably needs recommissioning on Bulb’s end.

Who installed the smart meter and when did they? Also a picture of the smart meter would help me here.