PEOPLE often claim to be “a little bit OCD” if they like a spotless kitchen or get stressed when their desk isn’t in order.

Ditto for if the sounds of dishes scraping, hinges squeaking or gum smacking bothers you or makes it difficult to concentrate ...

Why? Because that's the only way Downton Abbey actress Tuppence Middleton - who suffers from crippling OCD - can be sure they ...