"14(v) Even after the said remedial works have been carried out there will be a diminution of some 5% in the market value of the said house. A significant structural repair to a modern new built house during the currency of an NHBC guarantee is unusual. The current market value of the said house is in the order of£370,000 and£375,000 (assuming no defects) and the diminution in value of the house has been assessed as being in the order of£20,000 ."