WARNING: The 'default' programme version could not be determined
I sill see occasions like this in the log

Starting get_iplayer
get_iplayer 2.94-ppa23, Copyright (C) 2008-2010 Phil Lewis
  This program comes with ABSOLUTELY NO WARRANTY; for details use --warranty.
  This is free software, and you are welcome to redistribute it under certain
  conditions; use --conditions for details.

Running PVR Searches:
344:    Demolition - The Wrecking Crew - Episode 1, BBC Two England, , default

INFO: 1 Matching Programmes
WARNING: The 'default' programme version could not be determined
INFO: No versions of this programme were selected (available versions: audiodescribed,signed)
WARNING: PVR Run: _Demolition_-_The_Wrecking_Crew_name_tv: 1 download failure(s)

Any ideas?
Read the output. Only audiodescribed/signed versions are available, but you didn't request either.
Manual download via pid worked fine. Episode 1 also downloaded fine via the cron script...

Is there a wildcard version that can be used?

get_iplayer --output=$SAVEDIR --subdir --modes=best --version-list=default  --pvr 2>>$LOG
Update 2, manual download via pid - all 3 episodes in normal (not audio described etc) mode.

Guess this is a glitch with the index feeds?
The index only covers the last week or so by default. Only the audiodescribed/signed versions were broadcast during that period, but the original versions still happen to be available via PID

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