Do not engage this awful company. Beware of advertising statements promising that the price quoted is the final price, hidden deeply in the Terms & conditions are your responsibilities such as, ensuring adequate water pressure, suggesting buildings insurances, electrical survey all of which are at your cost. Question, why do this company charge you for a survey?. My advice, at the hint of a problem that is contrary to their promises act immediately within the contract to instigate a chargeback for your money paid and be determined. Important always read everything and act within the T&C and the Consumer Rights Act 2015. Better still avoid this company at all costs.