Delegates have started arriving at The Grove hotel for the secretive Bilderberg Group meeting at the five-star resort today.
A small number of protesters heckled a black Mercedes carrying an unknown attendee and being escorted by a police outrider in the last hour.
Among the guests due to attend the conference are Chancellor George Osborne, shadow chancellor Ed Balls, cabinet minister Ken Clarke and Christine Lagarde, the head of the IMF as well as the heads large corporations such as Barclays, Amazon, Google and Shell.
Activists and demonstrators have also started to congregate in a designated protest area in the grounds. They have been joined by Labour MP and outspoken critic of the Bilderberg Group, Michael Meacher.
Meanwhile a massive police operation is being mounted around the hotel using anti-terror laws to close roads and footpaths. A no-fly zone is also in effect over the grounds.
All public rights of way across the grounds of The Grove, including the towpath of the Grand Union Canal, are now suspended for the duration of the three-day conference.
Grove Mill Lane has been shut down by police to all non-residents and residents attempting to use the road will be asked to provide police with photographic ID.
Pedestrians will also be prevented from using Hempstead Road and Langleybury Lane, south of the M25 crossing.