On Tuesday 4th June the PBS America channel (Freeview HD channel 91, Freesat 155 , Virgin 276 , Sky 174 , Amazon, My5) at 9 p.m. will be showing a programme called 'Operation Crossbow' which looks at how aerial reconnaissance photographs were used to find out about the V1 and V2 weapons.

It will be repeated on Wednesday 5th June at 00.45 a.m., 10.20 a.m.and 15.15 a.m..