In the Crown Admissions at trial, the CPS reported that “the police scenes of crime department examined the house and garden looking for any evidence of the location of a localized fire. Results were negative.”
Any discolouration above the ground level is either inherent in the brick design, or is the result of fungus or moss forming on the surface. Discolouration below ground level is caused either by moisture or previously adhering surfaces. I have attached some photos which will hopefully give you a better sense of the scene as a whole.
Photo 4 - Notice the two gravelled areas. These are the areas of underpinning pre-dating the area by the garage in which Samuel's body was buried. The dimensions are near identical. In shot is a bag of sand for ongoing building works at the house.
Photo 5 - Close-up of one of the areas of underpinning at 2 Prospect Close. The concrete here has been gravelled over.
Photo 6 - The rear drive of 2 Prospect Close, still incomplete at the time. Notice how access to the rear of the property is completely open to the street.