I've only got part way through the first (and won't bother with the others) but the big surprise for me is how tight the post-production schedule must be if they were filming episodes due to be shown in February/March in December...

That doesn't leave much time for editing, dubbing, adding the soundtrack, any effects work on any of the shots etc etc.

Or am I too used to film production and all 'high quality' TV works like this?