C E Macfarlane c.e.macfarlane at
Sun Aug 30 18:49:41 PDT 2015

Please see below ...

>     > I can see no evidence for any such distinction, AFAICS they
>     are used
>     > about
>     > equally.

>     Is it possible that the p0... ones are essentially re-broadcasts of
>     'archive'
>     programmes, whereas the b0.... ones are current productions?

No evidence for this  -  for example the Ian Hislop programme in my list was
first broadcast in 2008 so is most definitely a repeat, but its pid begins
with b0 ...

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