There may be situations where the Home Office finds that they have made a mistake and not given you this condition when they should have. Where this has happened the Home Office will write to notify you that you are required to register. In addition, this condition may be imposed by a Border Force Officer if the omission is picked up on your arrival in the UK.
The Home Office has made an error if you have either:
If you have been given the police registration condition in error
You can find out how to correct this error by reading the UKCISA Passport, visa and BRP problems webpage. If you decide not to request a correction of such an error, you should try to register with the police. However, it is unlikely that the police will allow you to register, in which case retain evidence that you tried to comply with this condition of your leave, even though it was given to you incorrectly (for example, you could ask the police to confirm in writing that you tried to register with them). If the police will not allow you to register, and will not confirm this in writing, you are not obliged to have this error corrected.
If you should have been given the police registration condition but it is missing
There is no need to register, or to take any action to correct the error. However, your Student Sponsor is obliged to report to the Home Office any incorrect conditions that it becomes aware of. If this happens then the Home Office may take steps to re-issue your immigration permission with the correct conditions and you would have to register with the police.