I think you are just trying to make your answer fit. its a misleading reply you just would not back down there.
@Blonderabbit What I said and what I still believe is possible is :
"At the very least you could back a vehicle into the entrance of the alley."
This action by a perpetrator would act as follows:
Block the alley so that it would stop anyone else from walking down there whilst they were involved in removal
Allow them to have almost unhindered access to the back of Claudia's house and to be able to carry more easily someone or something into the back of the same vehicle
Facilitate a speedy exit.
It could be said that the above action could be caught on camera but if you look at the footage for Alley person-That camera does not cover the Alley (It can be identified as a "Globe Type" camera positioned up high on a pole into the main body of the Limes Car Park.
I have just looked at the other cameras in that vicinity and they are facing a particular direction that again does not cover the alley or would not be able to show any activity on around or at the entrance of the Alley.
Perhaps that is why Police were asking "What were they doing" because they couldn't see them walking further up HP but had to assume that they were doing something in or at the entrance of the Alley.
Of course Police may have footage of a vehicle that drives into HP but not beyond the fixed camera that I have mentioned.
The purpose of Alley person could have been to survey the scene for vehicular access and avoidance of cameras?