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Flammable wooden fences along property lines can be replaced with metal or masonry.

"You can see a huge chunk of Roman masonry, and it's incredible that it survives this well. We're absolutely thrilled that there's so much of it here," said Sophie Jackson.

Then they are introduced to an array of different trades including bricklaying, carpentry, masonry, iron work and sheet metal work.

Footage on social media showed a huge blast at the house in Ilford - which has been converted into flats - with chunks of masonry being thrown into the street.

There was also much damage from falling wood and masonry, and from water from firehoses.