Thanks for your help Davc. I can manually read both of my meters now, but it would have been nice to monitor them on the IHD. I have emailed SP and requested that they confirm they can still read my meters remotely. I know it wont fix the IHD, but I will be leaving SP at the end of my present contract (November).
@grumpyxch. Thanks for the reply. The first type of IHD usefully showed meter readings but with the new colour ‘Chameleon’ IHD they have decided to remove that feature. Words fail me. Good luck when you leave SP but most of the suppliers are in a mess over the Smart programme.