Reading another forum there was much discussion about why the finished model did not look quite right. The problem seems to be with the nose area, and the forum discussion centred around the overall length of the model. However it mainly involved comparing the Sword kit with the Airfi new tool Lightnings.
Comparing the kit fuselage with Richard Caruana's plans in the Modellers Datafile suggests the length is right, but that the nose is seriously undernourished. Measuring the intake indicates that it is 1mm taller than it is wide, when it should be circular. Also the kit windscreen and canopy were too wide for the fuselage.
Taking all of this into consideration, I decided to leave the length of the fuselage alone, but add a 1mm shim at the top and bottom of the intake, tapering back to nothing behind the cockpit area. In addition a 0.5mm shim was added to the lower rear fuselage so that the two exhausts were f equal width. The shims at the front were left proud of the fuselage and profiled to the new fuselage shape I wanted - these will be faired in with filler later in the build.
As always it s easier to show what I did with pictures, so here goes....