From previous releases of files, we know that others also had the job of testing people by chatting to them, plying them with drink and so on - eg Noreen Riols,

From previous releases of files, we know that others also had the job of testing people by chatting to them, plying them with drink and so on - eg Noreen Riols, whose book mentions the Fifi story. But Fifi was more notorious because supposedly her job was to find out if agents talked in their sleep; apparently after 1943 trainee's rooms were bugged instead. They don't seem to have mentioned that this time around, so maybe that turned out to be just a rumour.