Prefabs only went up because other houses had gone down. Between July 1940 and March 1945 half a million homes were flattened and a quarter of a million badly damaged. Twiverton got off quite lightly during the war (not that the twenty-seven Twivertonians some of the bombs landed on would agree.) The Railway Inn and the parochial school were annihiliated, but no one was inside them at the time.
A prime target for Adolf Schicklgruber's bombers was the major port and industrial centre which lies ten miles to the west of Twiverton. Over fourteen hundred people died during the Bristol Blitz. Bath's turn came during the Baedecker raids on historic cities. This was 'revenge' for the RAF's bombing of Lubeck on the 28th and 29th March 1942. The bombing of Bath on April 25th and 26th 1942 left four hundred and seventeen people dead. Schicklgruber's bombers had a clear run as the pilots at near-by RAF Colerne had been sent away on week-end leave!
'Ozzie' Oster's mum was in Bristol when it was being blitzed. Some of the pilots who were dropping bombs on her could have been from her home town of Koblenz. Some of her old friends and neighbours would have watched her mother being taken to Koblenz Railway Station and sent off to the Belzec death camp.

"When you've got friends and neighbours, All the world is a happy place." (The Billy Cotton Band song.)

One night 'Ossie's mum felt too tired to make it to the air raid shelter. It received a direct hit, and the couple from next door were killed. Then she moved to Bath and arrived just in time for the bombing there. Fortunately the bombs missed her. But unfortunately the polio germs lingering in her bomb-damaged flat did not.

George Orwell: "As I write, highly civilised human beings are flying
overhead, trying to kill me."