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"When you look across London we have loads and loads of terraced houses and no matter where you site the appliance it is always going to be within one metre of the boundary," he said.

Born and raised in a small terraced house in Norwich, on leaving school at 14 he started a series of odd jobs.

Here the streets of Victorian terraced houses are home to large multi-generational families or have been divided into flats.

Mr Wharmsby, who lives in the town, was captured on video emerging from the partially collapsed terraced house.

One terraced house was destroyed and two more partially collapsed in the blast.