Looking at the initial footage, and especially the charred remains, it really looked like the left-hand side got the worst of it and so I thought the left must have been the start point. Just goes to show you can't tell anything by superficial observations. Not that the investigation is complete (hardly even begun)!
I'm constantly amazed at what they find out in investigations. Such attention to detail. (Some may beg to differ, of course
) Have to wait and let them do their work.