Pic 3 was taken at 16.40 (i downloaded it and checked the exif data) so the time is set correctly give or take a few minutes.
A few things that need checking.
1) are you actually on an economy seven tariff ? You can normally tell from either your consumer unit or your electricity meter
(depending on the meter you will have one or two buttons to press, first press will show daytime units used, 2nd press nighttime units)
2) do you actually have voltage at the lower of the 2 immersion heaters (Remove plastic cap and check with a multi-meter (black lead from the meter to negative then the red to positive, fingers well away from any bare metal) NOTE there will only be voltage present when switched to E7 if you are indeed on E7
I notice in one of the pics that "Boost" is on, Boost is normally connected to the upper immersion heater. There is no cable running to that immersion... If it turns out that you have had E7 meter removed in the past then boost may be normal to heat the water.
Immersion thermostat should be set to 55 C approx (black cover off and check, also check if a reset button is present, some have them, some don't)
Finally for now, the immersion element itself could have failed. In which case the cylinder needs draining and the element and thermostat replacing.