Well all I can tell you is,I had City and Guilds for radio and radar, and was of course universally qualified to work,and sign on all types of aircraft, and worked in selective plating as an instructor for an aircraft company,I did do 14 years in the forces,and am now living in Chengdu,I am English and my wife naturally is Chinese,She speaks English quiet well.At the moment I am doing voluntary English teaching to the senior citizens.If I can be of any help to you,please let me know.Norman S Miles