We have the answer.
Wellington MkIII with the 4000 lb cookie bomb bay.
The Smith Gun with one wheel removed and stowed side on, also no evidence of the gun shield – no doubt removed to save weight.
Photgraph is from the Airborne Forces Experimental Establishment Report P66 published in May 43. At this time the Airborne Forces were trying anything as for the Smith Gun sense prevailed and it was handed down to the Home Guard, although a picture of a crashed Hamilcar at Tarrent Rushton shows a number stored around the building the Hamilcar landed on!

Not a Beau but the right country.
‘Crude Anti-tank gun’ Close but no cigar.
Hint (of little help) The photo was taken in 1942.

Many thanks for the information chaps. The following is what my Father wrote about the event on the 8th.

The rain for the past 3 days here has equalled any Manchester can produce and just being in a clay bound slit trench doesn’t make you exactly cheerful. Anyway It has just stopped now and the sun has peeped out for a moment so I’II take the opportunity to do a spot of sun bathing whilst I wring my shirt out. We have had the RAF heavies bombing the Boche defences just in front of us and from where I am I have a grandstand view of it all. The bombs must certainly have been effective and even we from 2000 yards back could feel the blast, and my goodness what a concentration. I am sure there must have been close on 400 Lancasters & Halifaxes all dropping the loads In such a short time that it sounded like a super-machine gun firing. One or two aircraft were hit by Flak and the crew of one (Canadians) baled out In our area.
Of course, we Invited them to breakfast and gave them a nip of whiskey and generally swapped yarns. They were genuinely surprised that we should live in such discomfort and not get more notice taken of us. They remarked that 12 hours previous they were living in a most luxurious mess, in England, and so suddenly undergo such a change of surroundings. I would have liked to have one of Jerries bombardments Iaid on for that moment, just to impress these fellows that it is a damn sight more unpleasant sitting tight in one place and being shelled than it is to dodge flak in an aircraft moving at 300 miles per hour. After all they go home and get a spot of leave while the PBI still has to stick it out.

As a Chadderton built aircraft parts of her would certainly have been made at Newton Heath where my Grandfather (William wilkinson) was the Works Superintendant.

The attack on Le Harve wasn’t the only large raid father watched from close in his letters show respect for the RAF even when they accidentally attacked the Black Watch front lines “our fault for getting too far ahead” . There was contempt for the Luftwaffe and absolute distrust of the Americans after he was caught up in the accidental bombing of Canadian and British troops near Caen.