It is, so far as I can tell, genuine; a BBC recording from September 1943 when correspondent Wynford Vaughn Thomas flew in Lancaster F for Freddie of 207 Squadron on a raid to Berlin. (As a slightly pedantic point it's not radio chatter, it's the internal intercom system of the Lancaster.) A CD is available with the complete Berlin raid recordings, along with other material, [Bomber Command at War (Volume 1)] (http://cd41recordings.com/bomber_command_vol_1.html) (see link for liner notes with further details); it's also on [Amazon digitally] (https://www.amazon.co.uk/RAF-Bomber-Command-War-1939-45/dp/B0027ZSTYK), included with Prime in the UK at least. BBC correspondents filed several reports on bombing raids; two even died on raids, [Guy Byam and Kent Stevenson] (http://www.bbc.co.uk/news/magazine-34144792).

For the Berlin raid Vaughn Thomas was accompanied by sound engineer Reginald Pidsley, who had a portable disc cutter to record the commentary and crew; Pidsley had to warm the discs in his flying jacket before using them due to the low temperature. That's probably the main reason that recordings are rare, it wasn't standard aircraft equipment, recording needed bulky and specialist devices; reel-to-reel magnetic recorders were only just coming into use in Germany, the BBC used disc cutters like the [Type C] (http://www.orbem.co.uk/repwar/wr_recorders.htm) and slightly later [Midget] (http://www.orbem.co.uk/repwar/wr_midget.htm).