Other accommodation off campus, but relatively close by, can be found here
The two closest (but more expensive) hotels are the "Holiday Inn" and the "Travel Lodge"
Below are links for information about the conference activities:
On site accommodation can be booked through the registration tab. The onsite accommodation is in in "Band D en-suite" rooms on the campus of the University and only a short walk to the conference halls.
The accommodation also includes breakfast.
Room numbers are limited, so book early to avoid disappointment. 
A detailed campus map can be downloaded from here.
The Conference will take place in the building labelled "26" - Lecture Theatre Block - on the map.
The Surrey Ion Beam Centre.
The University of Surrey University Campus