Advisory services relating to and the installation of solar energy powered heating apparatus; advisory services relating to and the installation of geothermal heating apparatus; advisory services relating to and the installation of wind turbines; advisory services relating to and the installation of apparatus for the collection and re-use of rain water within the plumbing system; central heating installation; maintenance and repair of heating; installation of ventilation; construction of ventilation shafts; advisory services relating to and the installation and maintenance of plumbing; installation of process pipework and gas pipework.;