They have repeated some on BBC Four in the recent past, in fact I believe we watched some together last year. They're rumoured to be replaying 1 measly serial for the anniversary. But I'm surprised they haven't managed to come up with some idea to fill the schedules, 1, 2, 3, 4, they could have retrospective, cheap but new shows on BBC One, BBC Two with repeats of the new series, 4 with repeats of old, and then the new Anniversary stuff could share between 1, 2 and 3 and they'd have filled 10s or scores of hours for very little money and have pleased the fans.
I'm not saying they should
do that, or that we deserve
that, or anything like that. But it would make sense and be fitting in the anniversary year to do something special if not expensive.