Officers received reports of a number of people gathering on land off Potton Road, in Hemingford Grey, with cars reportedly becoming stuck on muddy roads. A spokesman for Cambridgeshire police said: As more information became available, there were estimates that between 100-200 people might arrive at the location. By the early hours of Boxing Day cars were being parked at surrounding locations, including at the Lakes Business Park and on roads in Hilton, with people walking to the site. The spokesman said that police called in Cambridgeshire Fire and Rescue Service, as well as a helicopter, in order to monitor the situation. The spokesman added: Police and fire officers inspected the buildings being used as part of the rave and found no safety hazards. Officers stayed on site as people arrived and left during the night. People started to leave the site by midday on Boxing Day and the final revellers had left by 4.30pm. Police arrested one person on a charge of driving under the influence of drugs.