Lecturer giving automatic top mark to the first person to submit
This type of marking is a clear deviation from every set of marking guidelines I have ever seen. Intentionally introducing procedural irregularities is something that can get faculty in trouble. This is something that can and should be brought up to the director of teaching. If that fails you can talk to someone in the student union. You could also get in touch with the external examiners when they come to visit.

It is unlikely the director of teaching would reveal your name when discussing this with the lecturer. If you are really worried, drop a note in the DoT's mailbox with the module number, lecturer's name, and a description of the problem. The behaviour is easily verified so the DoT does not need your name to follow up. The problem with being anonymous is you will not know what happened.