The properties on the journey are set far back.
They will not record the road, just the property, in the event they did hae security cameras.
They would not pick up Bambers astra.
And even if in the event they did pick up a car it would be a side view and a positive ID could not be made, they probably would even have trouble guessing the make of the car, Bambers barrister could turn round and say " well that could be anyone "
It was 1985, technology in it's infancy only a personal visual ID of Bamber would suffice.