Only one London street atlas identifies this as a discrete locality, situated north of Harefield proper on Rickmansworth Road and consisting of little
more than a farm and a mansion. There has been a farm here since at least 1684, when it was called Guttersdean Farm. In the
late nineteenth century exotic fruits and vegetables were grown for the London market in over 100 greenhouses with 50 miles
of hot water piping. Harefield Grove is a grade II listed house, probably of eighteenth century origin but significantly altered
on a least two subsequent occasions. It is most notable for its grounds, with lakes and a waterfall, which are among the few
surviving landscaped gardens in London not to have been opened to the public. The house was restored and converted to offices
in 1985.
A small studio was constructed at Harefield Grove Farm to create CI5’s headquarters in the first series of The Professionals,
a 1970s crime-action drama. Some exterior scenes were shot at locations nearby.
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