A revised version of the practice spreadsheet model is now available for use in preparation for the Summer 2008 examination.

The formulae in cell H3 has been changed to =F3*0.5+F3*0.5*(1-G3) and has been replicated in cells H4, H5, H6 and H7. This is to solve the problem whereby the carbon footprint was increasing when fuel solving items were added.

This is how the examination spreadsheet will appear when released on the 28th April 2008.