 The graduate community at Castle forms the Middle Common Room ( MCR ) , which is based in the Maurice Tucker ( previously William de St @-@ Calais ) Room . However , due to size restrictions , no members of the MCR are currently able to live in the college grounds . The MCR , like the JCR , organises a number of social events and activities , such as the college 's entry into the inter @-@ collegiate University Challenge competition , which acts as trials for the University 's team . The Senior Common Room ( SCR ) , is an organisation of academics and tutors connected to the college . The SCR also organises formal meals with guest speakers . 
