There were about 15 candidates on the day. There were 3 tasks on the day, a motivation and innovation presentation and interview, a technical interview and a group exercise. The first presentation you had to prepare a 5 min presentation about your motivations and any innovation RR could look into in the future. You present to one assessor and can stand up and use a flipchart if you wanted, I sat down and didn't use it. Followed on from this there were a few questions about the company and how the company works, their clients, why you would be good for RR etc. The Technical interview took about an hour, and a variety of technical questions and the odd competency based question was asked. The technical questions covered a range of topics from materials and structures to how a Turbofan works and what materials make up the different parts of the engine. I was shown an oil flow diagram and asked to explain it, as others have mentioned. Finally I was given a list of topics and asked to quickly describe it in laymans terms (I chose the steam generator). As one group was having their technical interview, the other took a short tour of the building and a look at the museum where they have various engines. The group task was the paper plane. I was contacted within 3 working days of the result (despite being told I would be contacted within 2 working days!). Overall a good experience