Interesting, looks like it is Easyjet then, we'll get right onto this- thanks!

Hello, thanks for reporting this, if we can work out which advert is causing this pop-up then we can get it reported and blocked.

I can see easyjet in the (v. helpful) screengrab you've posted, has anyone else seen this ad & pop-up together? We also run an ad at the end of the page so I just want to check that that ad is not the perpetrator. Thanks!