Many of the questions in the Bristol bank are exact copies from ATPL questions, however in the last few months/year they have been trying to get as many new questions in as they can across the subjects due to Bristol, don't rely on it by learning the answers.
As Paco said before, our class had a 100% Bristol M&B exam and people mostly got very high marks (I even got 100%), the next class got a load of brand new questions with some of them being unlike anything on Bristol, in our books or practice exams and many people failed the exam. This is extraordinary as M&B is usually a furnishing exam to buff your average like IFR/VFR Comms.
This has also been the case for Performance and Principles of Flight particularly, we were told, but I'm not sure if its scare tactics, that they are trying together similar questions but opposite answers that catch people out who haven't learnt the whole thing through Bristol.