So, I've pulled together all of the elements in Photoshop and produced the final image. I used Gordon's model village as the background and arranged the buildings into a bit of a courtyard. This image was then enhanced in Photoshop with a photograph I took of the sky as the backdrop. Finally I put in the cleaned and sharpened photo of Gordon's Dad.
I gave him a shadow to make it a bit more realistic and resized the image to fit the output - which was a 30cm x 30cm canvas print I ordered from VistaPrint.