This is the 1:24 scale model (not the little 1:72 models). Includes paints. Finished model has 18" wingspan and is 15" long.
"This 1:24th scale model of the Supermarine Spitfire MkVb contains an electric motor for propellor spining action, plus paints; glue and brushes. For ages 14+."
There are a number of other Airfix models half-price including the fighter collection gift set (5 models with paints) for £14.49 and starter sets (now including the Spitfire) for £3.48.
Fighter collection: http://direct.tesco.com/q/R.205-3047.aspx