Dealer A did not see service use, but its successor, Dealer B (Mark 30 Mod 0), a conventional design of a passive acoustic homing finned torpedo using contra-rotating propellers, achieved a high hit rate against submerged targets during trials in 1953 and was issued starting in June 1954.

[6] The reason for this decision was the impending retirement of the Avro Shackleton and Fairey Gannet aircraft, with no adequate replacement; the upcoming Westland Wasp ASW helicopter was incapable of carrying the Mark 30.

[8] Specifications:[9][6] Mark 30 Mod 0 Project for a rocket-propelled torpedo with the function of an anti-torpedo countermeasure, initiated in 1951.

[10] A proposal for "Camrose" was drawn up soon after the end of the Second World War, but research only commenced in 1951 after a study was published detailing the feasibility of anti-torpedo torpedoes.

The concept envisioned a rocket-like weapon launched in salvos from the decks of surface vessels, which would dive into water and proceed for some distance at a speed of 50 knots.

[11] An acoustic influence fuze would listen for hostile torpedoes in its vicinity, and detonate its warhead when a weapon were detected within 45 feet (14 m).

In 1955, the "Camrose" project was canceled due to an assessment that warships would not be capable of carrying sufficient units of the countermeasure to defend themselves against hostile torpedoes.

Both "Bootleg" and "Camrose" had a similar appearance of a conventional torpedo with a ducted nozzle which did not have propellers, instead having a solid rocket motor with a high aspect ratio.

The method of employment for the "Bootleg" would have involved a high-speed strike aircraft such as the Westland Wyvern or Blackburn Buccaneer tossing the weapon at an enemy warship from approximately 5,000 yards (4,600 m) or more, with the torpedo's motor igniting immediately, in flight.

After traversing most of the distance while airborne, the torpedo would dive at high speed and reach the target underwater.

The ERV was launched underwater, from a depth of 15 feet, at the Arrochar torpedo range in Loch Long, Scotland.

Climbing at an angle of some 30 degrees to the horizontal, the ERV attained a maximal altitude of 200 feet, and after 14 seconds of flight, dived again some 900 yards from the point at which it emerged from the surface.