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Cavity wall insulation quote for "super silver"

House is around 2800 sq feet in size and we are currently on a serious energy reduction crusade

Having a biomass wood pellet boiler installed in thd new year to replace oil. Have just brought loft insulation up to 300mm and got a quote for cavity wall insulation this evening

£1800

We have existing 20-25mm polystyrene boards I the wall
His guy admits that he is much more expensive than other firms it he uses only the best quality beading called 'super silver'

Anyone have any experience of this ?
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