It's probably easier to try and join a company which conducts flight testing in a non-FT role first, then migrate across in-house. A job with QinetiQ is currently, as I'm sure you know, the only way to get yourself to ETPS (unless you join the military) - and with it the elusive FTE title. In my opinion the easiest way is to join QQ/BAE/Leonardo on a graduate scheme and work your way up from there. Obviously that may not be appropriate depending on your circumstances...