Vampiredave,
Thank you very much for the suggestion about the aircraft being PR34. After careful studying of the photographs, I can make out the camera port in the starboard bomb bay door.

Mosquito PR34 – also mentioned in the article:
‘How the Vampires crossed’
http://www.flightglobal.com/pdfarchive/view/1948/1948%20-%201135.html?search=atlantic%20crossing