https://www.bbc.co.uk/history/worldwars/wwtwo. The bicycle was purchased on HP from Halfords and modified in a terraced house in Coventry. The bomb was a liquid explosive, in a bottle concealed in a book carried on the bicycle. The remains of the bicycle are in the Coventry Police's "Black Museum". Schrapnel from the blast is reported to have travelled over 2 miles /countdown_390828_mon_01.shtml