Do read the above message. It is nearly two years since this website was last updated. At that time it was stated that, in reorganizing my websites, my intention was to divide the Physics theme from the Technology theme, though both have common ground concerning the Energy topic. This ENERGY SCIENCE site became the one dealing with Technology, extracting much from the site operated for several years past which had the URL www.energyscience.co.uk. The latter site was replaced by these web pages having the URL www.energyscience.org.uk. The Physics web pages are now to be found on the separate PHYSICS site having the URL www.aspden.org. To visit that site press PHYSICS.