Heinkel He-111 or Junkers 88?
Which Bomber attacked the shelter?
The type of aircraft involved in night raids was not always known.
Reports at the time suggest either a Heinkel He-111 (pictured below) or a Junkers 88.

photo courtesy of David Schultz AirShows and Air Age Publishing, USA
The Heinkel was used most commonly over Britain in 1940, but because of high losses due to its relatively light armament and slow speed it was withdrawn from daylight bombing. It was used in night bombing missions over London until the end of the war.
The Junkers 88 was used throughout 1940-1945.
It is commonly thought that the Wilkinson's bomber was 'dumping' his bomb load before returning to base. It is more likely that the pilot thought he was over his target and released the bombs deliberately.