Further tests have now been completed by the pathologist who has given a result of carbon monoxide intoxication.
A petrol-driven pump was seized from inside the home address at the time of Zane's death and Surrey Police is conducting further inquiries to establish whether there is any liability or criminal offences in respect of the hire company who provided this equipment.
More top news
Detectives are appealing for information following an armed robbery in Bexley.
Parents of a brain-damaged boy have lost a a appeal after a High Court judge allowed doctors to stop providing life-support treatment.
The Night Overground network extends to serve Highbury & Islington and Canonbury linking the service to the Victoria Line.