This free room finder searches the UCL Room Booking database in order to find rooms that are currently unbooked - you can hopefully use this to find rooms to study in when the Cruciform Hub is full (i.e. always). However, there are a couple of limitations:
Just because a room is unbooked doesn't mean that some students haven't already found and occupied the room.
Last minute room bookings made by the union may not be put through the database (sadness).