I applied online. The process took 5 days. I interviewed at GE (London, England) in Nov 2017
Interview
Applied online. Completed an online test, asked to complete a video interview which had 13 questions. first 7/8 questions were just about basic details regarding your visa etc. last 6/7 questions were recorded videos - mostly competency based questions.
Had to pass the online testing, which I did. Was asked to complete the video interview. Was quite a standard one with some motivation and behaviour based questions. If you prep for all of the standard model questions, it should cover what GE will ask.