The Active Places database base in structured so that a single site may have one or more facilities associated with it (a one to many relationship).  Each site and each individual facility sub type will have a unique ID.  As the below example shows these numbers may be very similar but never the same.

The below example for Aireville School in North Yorkshire CSP shows a single site (i.e. Aireville School - unique id of 1010263), which has three sports hall facilities - one main hall (2008384) and two activity halls (2026284 and 2026285).