A harrowing experience for the family and luckily no one was injured.Hopefully Vauxhall (in this instance)will thoroughly investigate the cause.
However, won't the insurance cover the van and the building and contents insurance cover the other losses, although from the limited information,it sounds like there may not have been any cover as far as that's concerned.
We've all been moaning about insurance premiums recently..this shows why we need to pay them