I don't believe this to be genuine.
It's nothing like the broadcasts of Dimbleby and Vaughan-Thomas.
The intercom chatter is far too clear.
Since when did the RAF have bombardiers ? - they were bomb-aimers.
No cries from the gunners - " corkscrew port [ or whatever ]" - I accept that that might not have always been possible but the gunner in this clip is far too relaxed about it.