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Video: Cavity wall insulation explained

What is cavity wall insulation? How does it work? Can it save money on gas and electricity bills?

Simon Kelly from Dyson Energy Services, which carries out cavity wall insulations for energy firm E.ON, explains all in this handy video guide.

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James Cuff

James Cuff

James Cuff is head of content and social media. He joined in 2012 from The Sunday Times. View more from James