There were at least 7 of those airing in and out of breaks throughout September on E4. They seemed to be used in primetime only for all breaks to promote the third series of Celebs Go Dating, with the regular batch of E-Stings continuing to be shown most of the time otherwise - and these are also back full time now the series has finished. As I don't think they've been adding to the E-Stings for a while now it may be that programme-related bumpers are going to be mixed in more now for big shows instead.
Having subjected myself to a short amount of the show for the purposes of finding out the names of the 'Celebs' (alas not being a viewer of TOWIE or similar reality shows, I'm sadly not up on who da yoof consider a celeb these days), they appeared to have made all those 'against white' shots of the people for the first few minutes of the programme anyway, so it was presumably quite trivial to add the E4 logo to these. They also used the show's 10pm slot in at least one week to air the E4 equivalent of the advertising premieres they do on the main C4, with the Scottish Tourist Board clearly deciding that they need to target a younger generation now. I'm not generally a fan of sticking site links in the middle of a thread, but a load of this stuff from the past few weeks is up on this page:-