SENIB"The template" is now available in a free digital version that is called SENIB. It contains more functionality than the original template. It can be used to find out optimal energy consumption in a property and keep track of its energy use, but it can also calculate pre-setting values for radiator valves etc. More info can be found on the SENIB web page.
The templateIf you just want an overview of the main calculations then have a look at the original template. It can also be used to perform calculations by hand. You find it here.