Different User, Different Ads
Yes, the Adsense algo provides different ads based on many factors.
Ine of my sites is a tourism guide about NZ. I live in Switzerland, when I visit the site, the ads are often in German, and are frequently specific to Swiss or German companies selling travel. Likewise, when I have a staff member in Australia of NZ check the ads, they are particularly suitable to their viewing.
In short, the ads you see in the UK on your site, will likely be completely different from what US visitors are seeing.
I forget where it is, but there is a tool you can download ( I think from Adsense site) that allows you to see what ads would be shown on your pages in other locations around the world.
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