This is a de Havilland DH 112 Sea Venom. This one was manufactured in 1955. The Sea Venom is a variant of the de Havilland DH 112 Venom. The Venom first flew in 1949 and entered service in 1952. One unusual aspect of the Venom is the plywood monocoque construction of the fuselage forward of the engine. Also unusual for a jet still flying today is the Venom's cartridge starter. Instead of an electric motor or airflow from a ground unit to get the turbine spooled up, the Venom uses gas pressure from an ignited powder-filled starting cartridge.
Later, you'll see a picture of this Sea Venom flying during one of its demonstration flights.