The bomb, which dates from 1880 to 1890, is believed to have been fired from a warship using the beach as target practice.
The couple who moved into the house after the Morris family sank the device into cement, and when the Edwardses arrived in 1982, they painted it red.
But on Wednesday evening, a police officer knocked on their door and explained it would be necessary to take photographs of the device and send them on to the Ministry of Defence.
Less than an hour later, the same officer hurried back to the property to explain the bomb squad would be arriving the next day.
By 8.30am on Thursday, more police were at the property, followed by the bomb squad and the fire brigade, and there was talk of the street being evacuated.
However, the couple had decided they would be staying in their home regardless, with Edwards saying: “If the house goes up, we are going up with it.”
An X-ray of the shell by bomb disposal experts found it still had a small charge. “There was still a little bit of life in the old girl,” Jeffrey Edwards said. “They couldn’t leave it here just in case it decided to blow.”
Experts worked throughout the day slowly digging the bomb out of the concrete. It was then taken under police escort to a quarry in Walwyn’s Castle, where it was covered in five tonnes of sand and detonated the next day.
“I was sorry to see It go,” Edwards said. “It’s been part of my life all those years. It was sad to think of being blown to smithereens.”