'Brock' was a British intelligence deception in which unneeded installations in the southern English county of Hampshire were blown up to add veracity to the 'saboteur' credentials of 'Mutt' and 'Jeff', a pair of Norwegians who had surrendered to the British immediately after being delivered by a German seaplane in April 1941 and then volunteered to become double agents (1942).

The two other sabotages 'performed' by the duo were 'Guy Fawkes' in November 1941 and 'Bunbury' in 1943.