Saint Editha is a real Staffordshire saint, in that she existed (she lived in the early part of the tenth century) somewhere in or around Tamworth.
After that little fact (ie she definitely existed), almost none of the sources can agree about the details of her life story. In Amington Church, which is dedicated to her, there is this lovely little stained-glass portrait of her wearing a crown (she may have been a princess) - but that's as fanciful a idea of her as everything else.
A long, lovely article by Christine Smith attempts to sort it all out. (Well done for trying, Christine!)
Anyway... one source claims that today is her feast-day.