If you do, no harm in back tracking and asking "did I just say RAF Shrewsburry? I mean Shawbury". If you have a human being for an interviewer (usually you do) they'll probably chuckle and put it down to interview nerves but equally should give you a bit of credit for having the confidence to own up to a mistake.
Of course, if you do this in a written communication where you have the ability to read what you have just written before you inflict it upon your audience that chances that your verbal communication is much better is small...