I tried the same search on Android. A "featured snippet" covers the first page and more. Tapping on "About Featured Snippets" at the bottom of its UI tile tell

I tried the same search on Android. A "featured snippet" covers the first page and more. Tapping on "About Featured Snippets" at the bottom of its UI tile tells me a lot of stuff about it, but doesn't say it's an ad; it says they "come from web search listings" and are highlighted "if it would be useful". I haven't known Google to ever be evasive about whether something is an ad or not, so unless that's changed, I'm confident in concluding this is not an ad. The next thing I see is a tile with a map at the top and three "places" under it, with a way to expand the list via "More places". This doesn't appear to be an ad either. Again not identified as an ad, and I presume these are the most relevant objects from the "places" database that you normally see on Google Maps. After that, it's a series of tiles, each for a web site that appears to be coming from organic search results. So again, not ads. In summary, when I try the same thing on Android, I get no ads at all anywhere. I suppose your results might be different than mine, though. "Lake district cottages" is a term I'd never heard before, and it appears to refer to something in the UK. I'm not in the UK, but maybe you are since you thought to suggest that. (And maybe the ad systems know that and nobody wanted to buy an ad to show to me but somebody did want to buy an ad to show you. That's just speculation, though.)