This year, the practice has been stopped by the Andalusian government in Spain, where an estimated 2.6 million birds used to be vacuumed up annually
So, Spanish Olives are ok.
M0nica, not to burst your bubble, but be careful with rapeseed oil; from what I understand, it is not as healthy as one might be led to believe. See this article www.smartholistics.co.uk/news-blog/the-dark-side-of-rapeseed-oil/
To think that London, or anywhere else for that matter, does not belong to any one demographic