Thanks for the reply. I already did told and was told that there is ground for refusal but she has never heard of anyone getting their visa rejected due the police registeration.
Just wanted to hear more opinions esp due to the fact that I'll have to go again.

I just finished my undergrad this summer and will be doing an msc in the same uni. I will be applying for a tier 4 extension through the university, one of the supporting documents required was police registration. I only registered to the police when I arrived and never updated my details and left ...