Here are the Accommodation Terms and Conditions:
And here are the references to "Overnight Visitors":
8. Overnight Visitors: These are usually permitted but only by prior formal arrangement with Accommodation Services, whose decision is final. Maximum stay is 3 nights in any 4 week period. The Tenant is responsible at all times for the conduct of all visitors brought into the campus or Halls of Residence.
20. Multiple Occupancy: It is a condition of the Tenancy Agreement that the Accommodation is let to the Tenant and that no overnight visitors other than those approved in terms of Clause 8 of this Tenancy Terms and Conditions are acceptable.
No unauthorised guests are allowed after midnight.
All overnight guests (after midnight) must be registered with an overnight guest pass by 4.00 pm on the night of the stay and the conditions of stay must be adhered to.
"You've pulled!, give me your name and a passport photo so I can book you in for a shag at my place tomorrow night"
Sounds like something from the 50's where you and your visitors had to climb over the wall after the college was locked at 21:00.
Does anyone take any notice of this?
... and the ones that won't