The map of Oakley Park shown at the beginning of the movie is in fact that of Banbury, Oxfordshire.
It states in the main titles "and introducing" Elizabeth Seal, but it's her second movie, her first being Radio Cab Murder (1954).
It seems the police are so keen to solve the murder their drivers would qualify for F1 drivers today!
Opening credits: All characters portrayed in this film are purely fictitious and any resemblance to any actual persons, living or dead, is purely co-incidental.
The action takes place in Oakley Park. A Surrey Ambulance Service vehicle is glimpsed, while a County of London Civil Defence Corps van can also be seen.