There it is: I have already said it. I would only add that this inability arises from the devices that were added to my meters when the ‘Smart meter’ was installed in my home, by my previous supplier. The effect of ending my contract with them is a blank screen on both meters. I wanted to report this to Bulb, but have been unable to locate a ‘Contact Us’ option for scenarios such as this. That said, I now realise that I neglected to use the ‘Help’ tag!
There are all the faqs and a contact Us option to ring them.