The Millennium Dome Raid — A £200M Diamond Grab Caught in a Police Trap

On the morning of 7 November 2000, a gang drove a JCB digger through the perimeter of the Millennium Dome in Greenwich, south-east London, and smashed into the De Beers diamond exhibition intending to seize the Millennium Star — a flawless 203.04-carat diamond valued at around £200 million — and a set of rare blue diamonds worth, together, an estimated £350 million. They took nothing. Hidden behind a false wall built into the display room, and dispersed across the Dome disguised as staff, the Flying Squad of the Metropolitan Police was waiting, and the gems on show had already been swapped for replicas. The raid was over within minutes of beginning, and every man who reached the display case was arrested at the scene.

The outcome is a matter of public record and is stated here at the outset. The attempt failed completely: the real diamonds were never in the room, no jewels left the building, and the principals were convicted at the Old Bailey on 18 February 2002. Raymond Betson and William Cockram, treated as the leaders, were each sentenced to 18 years; Aldo Ciarrocchi and Robert Adams received 15 years each; and Kevin Meredith, the intended speedboat pilot, was cleared of conspiracy to rob but convicted of conspiracy to steal and sentenced to five years. A seventh man, Terry Millman, had died of cancer before trial. On appeal, several sentences were reduced.

The case is studied as the mirror image of most heist files. Here the crime was defeated not after the fact but in the act, because the defenders knew it was coming. Kent Police had the gang under surveillance for a series of failed armoured-vehicle robberies, and that intelligence let the Flying Squad mount Operation Magician: substitute the diamonds, fortify the room with concealed officers, and let the raid proceed into a trap. The result was a near-bloodless arrest of an armed crew at the instant of their crime.

The Millennium Dome raid is therefore a study in the value of forewarning. The gang’s plan against the Dome’s standing security was sound enough to have worked; what it could not survive was a defender who had read the plan in advance and rebuilt the target around it.