I have just completed the switch from Bulb to Pure Planet as they are coming out cheaper for me (East Midlands anyways)! They don’t do a E7 tarif, just 11.2p KWh 24/7! I find this better then an E7 as then I can charge the EV anytime of day, pure convince!
All things are relative it may be good for some if they have a very high usage .
However paying one of the most excessive standing charges I have seen to date is not so good for people on low usage like myself.
Energy prices per KW are subject to the same post code lottery as petrol prices which also vary massively around the UK so this tariff for me on my particular usage model that I use for comparisons in my neck of the woods is about £100 a year more expensive than several others primarily because of the £120 per fuel, per year, standing charge