Genghis, what path would you recommend taking to flight testing? I'd love to do something along those lines oneday, but B1 (and hopefully B2 aswell) first, then ATPL....
My recommendation would be either...
(1) Military + Test Pilot School, or
(2) MEng (Aero), try to get a job in a flight test department as an FTE; if you want to become a TP work on the flying as you go along.
There are quite a lot of threads in the "Flight Test" Forum on this subject.
G