A different type but the Valiant had a jettison system.
The underwing tanks, each holding 12,500 lbs of fuel were designed to be jettisoned in toto. being a hangover from a project when they were thinking of using them as bomb bays.
There were three mushroom valves in the bottom of each tank which when opened released the fuel. In an emergency one could put combat nitrogen pressure in the tanks and they would unload 25,000lbs in about two minutes.
The checklist was very convenient because it stated that at REP 3, the initial letdown point, the underwings had to be cleared of residual fuel as none was permitted on landing. Depending on the time of day, bar opening hours, rear crews' opinion of circuit bashing a competent co-pilot like me could arrange a that a considerable amount of fuel could be left in the underwings when we arrived at the start of the letdown.
There were some fairly massive contrails over the coast of East Anglia.