Awesome work! alex came in professional, knew immediately what to do fixed it and boom, done and out. Where can i buy drain out bathroom? Plumbers, gasfitters and drainlayers must be registered with the plumbers, gasfitters and drainlayers board and hold a practising licence. Q how can i have wall insulation installed? Combi my yo mother has just swapped to one and had her immersion removed she can't believe the constant hot water even though we've been telling her for years. Combi.