Ha ha - the girl on TV just now clearly didn't know the difference, but rather than using one, being consistent, and hoping she'd got it right, she chopped and changed word throughout the article, making her ignorance quite obvious.
But I must admit - I don't really know the difference either! Answers on a postcard, please (or in a comment)....
BEFORE YOU START: Please note that although I currently volunteer for both the Stroke Association and Age UK, the views expressed in this blog are strictly my own. I am not a spokesperson for either (or, indeed, for any) organisation, and I accept complete responsibility for the views expressed herein. As indicated by the domain name, I am based in the UK and the blog therefore has a UK bias - I've tried to use the Glossary to explain any ambiguous terms, but if you think there is anything I've missed, please message me.