EXPERTS probing a house fire that killed a mum and her two children removed an oil-filled radiator.

Izzy Collison, eight, and brother Harvey, five, perished with mum Justine, 33.

Teaching assistant Justine's husband Gavin, 34, was rescued from their detached, four-bed house by firefighters.

He remains in a serious condition in hospital.

Justine’s mum Diane Fletcher, 53, who lived with the family, survived unharmed.

Fire service experts removed the blackened plug-in radiator while dogs trained to sniff out accelerants were spotted.

The inferno is thought to have started in a conservatory on the the side of the house.

It is not known if Gavin, a civilian engineer at an RAF base, has been told his wife and children died in the fire in Collingham, Notts.

Locals speculated a faulty Christmas light may have sparked Saturday’s blaze.

The children’s headteacher at John Blow Primary School paid tribute to “gentle” Izzy and said “kind” Harvey would have been in their nativity play.

Justine’s gran Beryl Sandford, 76, of Newton Abbot, Devon, said: “We’re grief-stricken.”