[8] This was authorised on 14 September 1955, with orders from Queen Elizabeth II transmitted to the Vidal detailing On arrival at Rockall you will effect a landing and hoist the Union flag on whatever spot appears most suitable or practicable and you will then take possession of the island on our behalf.

[9] The Vidal arrived in position the following day, but were unable to land any men as poor weather prevented the helicopter from flying.

On 18 September 1955 at precisely 10.16 am, Lieutenant-Commander Desmond Scott RN, Sergeant Brian Peel RM, Corporal AA Fraser RM, and James Fisher (a civilian naturalist and former Royal Marine), were deposited on the island by a Royal Navy helicopter from HMS Vidal.

The team cemented in a brass plaque on Hall's Ledge and hoisted the Union Flag to stake the UK's claim.

The inscription on the plaque read:By authority of Her Majesty Queen Elizabeth II, by the Grace of God of the United Kingdom of Great Britain and Northern Ireland and of her other realms and territories Queen, Head of the Commonwealth, Defender of the Faith, and in accordance with Her Majesty's instructions dated the 14th day of September, 1955, a landing was effected this day upon this island of Rockall from HMS Vidal.

[Signed] R H Connell, Captain, HMS Vidal, 18 September 1955.The plaque was still in place in 1997, but was found missing after the rock was visited by Greenpeace protesters.