It’s not just side-characters! From their FAQ:
Will Big Finish be producing plays based on the current TV series of Doctor Who?
Until 2015, Big Finish releases were drawn from the worlds of ‘Classic’ Doctor Who, featuring the first eight Doctors and their companions. This restriction has now been lifted
Will Peter Capaldi be appearing as the Twelfth Doctor in any Big Finish releases?
Our licence to produce content based on Doctor Who includes storylines and characters up to and including Matt Smith’s final appearance in The Time of the Doctor. Therefore, we are unfortunately not able to invite Peter to appear as the Twelfth Doctor at the present time.
So, apart from The Twelfth Doctor’s era, they are now free to pull from anywhere from 1 to 11, including The War Doctor.
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