Pink book advert covers content

[DeltaFlyer]

The top advert banner keeps coming up with an advert that covers half of the page. The ads alternate and all the others are fine apart from this one.
It's very intrusive as it just pops up suddenly and you can't click off it or scroll away from it like one of the mid thread adverts.

Context I'm using my mobile on Android

Morning, @DeltaFlyer . Thanks for flagging this. Can we ask where you were on the site when this ad popped up? And if you see it again, could you click on it and then post its URL here please? That will just help us track it down more quickly. Thanks!

https://www.mumsnet.com/talk/am_i_being_unreasonable/5498559-school-refusing-3-days-off-for-ds-aibu

Thanks @HebeMumsnet
This is the thread I was on.

If it comes up again I'll get the url