I applied online. The process took 2 months. I interviewed at GSK (London, England) in Dec 2017
Interview
There are several stages which are detailed on the GSK website; application form, online assessment, motivational questions, video interview and then AC. Online assessment has both a SJT and numerical mixed in, motivational questions for me was just two questions about why GSK and my chosen programme. Video interview (which is the stage I am at, haven't heard back) was the most difficult of all. Most questions are competency based but if you are doing something science-y or technology related you will also have technical questions.
Interview questions [1]
Question 1
Normal competency questions but ALSO TWO technical questions! Make sure you know your programme inside out.