BBC Programme Identifier

A BBC Programme Identifier (PID) is an alphanumeric, persistent, unique identifier for a television or radio programme brand, a season or series, or an individual episode, used by the BBC in their web URLs, iPlayer viewers, and internal databases. All PIDs consist of a lower-case letter, followed by seven or more other characters which may be lowe...
Found on http://en.wikipedia.org/wiki/BBC_Programme_Identifier
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