That Summer Day is a one-hour docudrama directed by Jon East, written by Clive Bradley (who also wrote Last Rights), produced by Hannah Pescod and executive produced by Jon East and Mark Redhead that provides a fictional account of the lives of six children on the day of the bombings of the London public transport system on 7 July 2005. The drama combines fictional elements and archive footage from television and radio to document the effect the events had on the children. The programme's creation is the result from the correspondence the CBBC website received following the events, from children struggling to come to terms with it. In the early development of the show, the creators visited schools and people from charities like ChildLine, who had talked to children about the subject, to find out which themes and issues the programme needed to address to properly respond to the questions raised by children. The programme was filmed on location in London and at Islington Green School. Several of its students were extras during filming.