Two people are still critically ill in hospital following the blast.
George's parents Vicky Studholme and Stephen Hinds were also injured, although not seriously.
In a tribute they said: “We are devastated at the loss of our beautiful George.
He was so precious to us.
"We have no words to describe how we feel and just want time to ourselves to come to terms with what has happened. Our beautiful little angel grew his wings today.”