Sentence:  She was barely in her twenties, skinny, with a black Helen Shapiro semibeehive that was in need of fresh backcombing. She spoke with an accent he couldn&#39;t place, apart from it originating north of the <WSD>Watford Gap</WSD>. 
Meaning of the word marked with <WSD> tags:  The notional border between the North and South of England; the North–South divide.