In year one there are 80credits (out of a 120) core modules in Psychology that you're automatically signed up for and are complusory:
Cognitive, 20 credits (autumn semester)
Social, 10 crdedits (autumn semester)
Biological, 20 credits (sping semester)
Developmental, 10 credits (spring semester)
Statistics, 10 credits (full year)
Practical methods and seminars in Psychology, 10 credits (full year)
You then have to pick 40 credits worth from somewhere else. 10 of them CAN be from the one optional psychology module (addiction and the brain) but if you do this then the other 30 must be from outside of the school of psychology. This is the link to all the modules available at the uni but you can only pick level 1 modules and read the description of prerequisits to see if you can do it
http://modulecatalogue.nottingham.ac.uk/Nottingham/asp/main_search.asp - be careful with workload, number of hours and type of assessment - most will class with your timetable anyway!!
They recommend you do a 20/20 credit split of extra modules over autumn and spring semesters in order to balance the workload. I did an English Lanaguage module (was hell) and a Vikings module in the autumn, and currently doing a Geography module and the optional psych module this semester. Hope that answered your question :P
I'm not in halls (unconventional I know) but I have friends in most of the halls so can easily answer questions if needed