Ultimately, Brown was taken to meet the C-in-C of the SOE and arranged a demonstration similar to the one given earlier for the Army. SOE was given the transponder and told to hide it anywhere within a large area, and their aircraft would not attempt to find it until a week later. On 11 February 1942 one of the TRE's Avro Ansons took off from RAF Hurn and picked it up at a range of , approaching and dropping two containers within 200 yards. An order was placed immediately.