People there were very nice and open. I applied for the marketing internship position (B2B). The 1:1 interview was basically all behaviorals and they gave us a 4-page case, put us into a couple groups, and gave us 2 hours to prepare a presentation. The presentation was about 20 minutes with 10 minutes of Q&A. I didn't get an offer but the overall experience was very nice. What was best was that they gave each candidate a feedback from the assessors a week later.

Standard behavioral (tell me about yourself, tell me a time when..., why GSK). I believe there was 2-3 back to back interviews with 1 or 2 people each. They also had several online aspects where you had to answer questions based on different scenarios.