Yep, I hear you on this one.
I built a site about the historical aspect of our local town, and one year I added some cookie recipes for the holidays, and wouldn't you know, I had cookie ads on every page. They took over the whole site.
After the holidays, I removed the cookie recipes, every reference to cookies and every reference to recipes.
The cookie ads stayed for months after the holidays. I tried everything to get rid of them. I tried beefing up the keywords, I tried section targeting, and eventually just took the ads down.
Put the ads back up a month later, and they were still cookie ads, but let them run anyway, and eventually they changed to a different ad.
I wish I could tell you how long it took, but I was so upset, I just ignored the site for several months.
Maybe you can block your Brittany ads?