Thank you very much for your enquiry.
You are indeed correct in thinking that Electricity Display Devices are now a product on the market.
It was an initial government proposal to ask all energy suppliers to provide their customer's with one. However they have not followed it through and it is unfortunately unlikely to be the case. I do not know the reason why they detracted this proposal.
I would however advise that you type in Electricity Display Devices into a search engine and see what the results bring up.
I'm sorry we could not help you more on this but I wish you luck in your search for this product.