Provision of hyperlinks on a website; creating and designing web pages for others; creating and maintaining web sites for others; creating and maintaining weblogs (blogs) for others; hosting computer sites (web sites); hosting of weblogs (blogs); online provision of web-based applications; online provision of web-based software; provision of hyperlinks on a website; web portal services (designing or hosting); web site design; advisory services relating to energy efficiency; advisory services relating to the use of energy; consultancy in the field of energy-saving; energy auditing; energy use and conservation consultancy; recording data relating to energy consumption in buildings