Do you mean can we talk about cillit bang again? The topic being discussed was relevant to accommodation, and frankly more interesting than all the worrying and the minuscule unimportant questions which will be answered if people could just relax and actually wait for the university to send you the accommodation prospectus. With every intake I see the students on here getting more and more stressed out about really trivial things which will sort themselves if you give them time, and it's such a shame.
Anyway, back to your question cryptor. Halls generally aren't too bothered about guests; obviously a lot of people are going to be bringing people back from clubs and stuff in first year, and having friends come and stay over or visit. You're supposed to sign guests in in most halls (i think), but you can generally get away with not bothering. In Goldney, if you wanted to hire a mattress for your guest, you had to sign them in and leave a deposit and such, so obviously in those circumstances, you have to let them know. You'll be coming in with the visitor you're bringing anyway, and since you can get in any time, there's no issue about them coming in.