During the 2005 Es season a logo was spotted on an 8P offset on E4, a rough sketch was drawn of the logo and is shown below, at the time no positive ID could be made of the station. Recently while updating the logo gallery and trying to confirm whether a number of transmitters are still active I chanced upon the logo for the ERTU high education channel in Egypt as listed on lyngsat. The similarities are striking considering the unusual design. I've yet to confirm if Egypt is still active on E4 and if so what the offset is but could it be that ERTU High Education uses airtime on Ertu1 and this is what was seen on E4?
This is the sketch made at the time of the sighting on E4. The Ertu High education channel logo taken from the lyngsat website.