Who bombed Petworth Boys School, West Sussex, on 29th September 1942?

[Bombphoon]

Very sadly, on 29th September 1942, a lone Luftwaffe daylight raider bombed Petworth Boys School, West Sussex, killing 29 boys aged 7-12, plus the Headmaster, a teacher and two other civilians.

Various sources state it was a He 111, or more likely, a Ju 88, possibly of KG 6, as this website suggests:

https://www.ww2civildefence.co.uk/bl...school-victims

However, Taghon's detailed unit history of KG 6 shows the unit carried out no ops that day.

ATB The Blitz Then And Now Vol.3 barely mentions the incident in just one line.

So, which unit was the bomber from?