48 Hours per Week
The law is clear (ish). The maximum hours you can do per week is 48. You have to make an average calculation on this, but the law is still there. The difficult bit is convincing engineers to stop doing overtime when this limit is exceeded. Who am I to stop someone earning money? As an employee, you can opt out of this law if you choose, but I do not know of anyone who has done this yet, but I know that both employees and employers are in breach of this law. That is because both parties benefit from the arrangement.
If every engineer was on a salary, I am sure that the 48 hour per week limit would not be breached!