Began with a phone interview, followed by three rounds in person at the new London office. At all times, be prepared for 'about Bloomberg' questions, focusing on products and parts of their business. There is no formula for the in person interviews, it was very much a conversation which was nice. Be genuine, enthusiastic. Do not be surprised if your scheduled interviewer turns out to be someone else on the day, this happened twice to me. Didn't seem to affect the flow at all, everyone was great and interested in speaking to me.