Local directions once on campus
Enter by the main entrance. There are two channels that people may enter the campus through, one for visitors and one for card carriers. Come in through the visitor's barrier and tell the security person that you are attending the UKCI04 conference in the David Davis building. A campus map is available on the web via the conference web site. The conference is in room W0.04. The first 0 is the ground floor, the second 04 is the room number.
If you wish to go straight to the accommodation, this is in Royce Hall and the reception at all times for the accommodation is in Whitworth Hall. Once registered is should be relatively straightforward to find your room, and the reception at Whitworth are usually very helpful.
For directions to get to Loughborough see here.