Fuel injection apparatus

A fuel injection apparatus for a gas turbine engine comprising a prefilmer, the prefilmer comprises a body, the body defining an axis, an annular surface and a downstream edge, the prefilmer arranged so that when working in operative association with the fuel injection apparatus fuel impinges on the surface and flows, by means of a passing airflow, to the downstream edge, from where the fuel is shed, characterised in that the fuel injector further comprises a means for circumferentially varying the residence time of the fuel across the surface wherein the means for varying the residence time of the fuel across the surface comprises the surface having a circumferentially varied axial length so that fuel shed from the downstream edge is shed from at least two different axial positions.