1. A method of creating a three dimensional model of a unique body; said method comprising: obtaining a three dimensional model of a standard body; obtaining a two dimensional image of the unique body that is to be modelled; determining a location of the unique body in said image; determining a position of the unique body in said image; using the determined location and position data to extract a two dimensional outline of the unique body from the two dimensional image; selecting a measurement for which a value is to be calculated for the unique body; calculating a value of said selected measurement from the extracted two dimensional outline; using said calculated value of the selected measurement to update a corresponding measurement on the three dimensional model of a standard body; and outputting the updated three dimensional model of a standard body as a three dimensional model of the unique body.