Indeed so.There seems very little difference in the day rates (with or without E7). Even if the wrong way round, having E7 would presumably be cheaper in a lot of cases.
Prior to April 2017 (i.e. 2 years ago), I was paying 16.34 p/kWh day and 6.89 p/kWh night, and the corresponding non-E7 rate was 14.39 p/kWh. More recently (i.e. up until a couple of weeks ago) I was paying 17.15 p/kWh day and 7.84 p/kWh night, and the corresponding non-E7 rate was (unchanged at) 14.39 p/kWh.What were the comparisons of your old rates?
I suppose that it's not impossible that some (maybe many) other suppliers have done the same (seemingly daft, from their perspective!) thing in recent times - I don't know, because I did not really look at non-E7 tariffs during my recent extensive examination of what was on offer!
Kind Regards, John