email received from Electraphase 22/3/18:
We do take on E10 meter contracts and support them, but we do not offer them as an install option anymore. As in a customer can not request to change onto a E10 meter, but if they already have a E10 meter we will support it if they do not wish to change.
We offer E10 rates, but they are customer specific currently and on enquiry. We do not publicise them on our website or on price comparison websites. Mainly for the simple reason we do not get enough enquiries about them.