From my research on the photos (he took two photos of this aircraft), I have copies in my collection provided by Robert Astrella from his originals.
North American Mustang Mk.IA FD474 'K' served with No.268 Squadron RAF from June to September 1944. Photographed here at Mount Farm around March-May 1944 based on the external rear vision mirror and lack of other distinctive markings. Mount Farm was the base for one of the USAAF Photographic Reconnaissance Groups operating in the UK. This aircraft had been on charge with No.168 Squadron RAF from August 1943 until early 1944 when that Squadron converted back to the N.A. Mustang Mk.I. During its time with No.168 Squadron RAF it had been flown regularly by F/O J Colville (one of Prime Minister Winston Churchill's personal staff) who had also served with No.268 Squadron RAF. FD474 is recorded as being flown on operations by No.II (AC) Squadron RAF from early February 1944 to the beginning of June 1944 when it was passed to No.268 Squadron RAF when they started to re-equip with the Mustang Mk.II. In the photo there is evidence of what is potentially repaired metal work on the starboard wingtip, suggested by the lighter colour under the wingtip area and the absence of the yellow wing leading edge identification strip on that part of the wing – the area coinciding with specific panel areas on the wingtip. There is annotation in the No.II (AC) Squadron RAF records around the time when this photo was potentially taken of one of the Squadron's Mustangs wingtips being damaged in a night time taxiing accident where the wingtip hit an unlit obstructionon the perimeter track from the runway to the dispersal area.