The south-west part of Hertfordshire, surrounding Watford on three sides. Includes the London overspill of South Oxhey, the commuter towns of Chorleywood, Rickmansworth, and Croxley Green, and also Abbots Langley to the north of Watford.
Alison Wall (Durrants) moved from Liberal Democrat to Conservative in February 2018. The Liberal Democrats gained Oxhey Hall and Hayling from the Conservatives at a byelection on 12 October.
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