Sentence:  Without official recognition Gatwick has become the <WSD>Milton Keynes</WSD> of the south side of London, and Stansted looks set to be the same for the north-east. 
Meaning of the word marked with <WSD> tags:  Originally a village in Buckinghamshire, now a purpose-built town in central England, containing the towns of Bletchley, Wolverton and Stony Stratford and many smaller villages.