[James2001]

If the estate of Mike Smith can veto Top of the Pops repeats perhaps they can? (Or maybe the BBC can't be bothered to have the argument in that case)

I don't think Mike Smith (or his estate) actually had a veto, it was just that the BBC didn't show his episodes to respect his wishes, but I don't think there's anything legally to actually stop them showing the episodes (and BBC4 did the show the 1982 christmas special, which he co-presented, back in 2008).

Certainly several other presenters have said they had no say over the broadcast of their episodes, Mike Read and Simon Bates have both said so, and Andy Crane had no idea BBC4 were even showing his episodes until someone told him on Twitter on the day the first one was shown (not that any of those three have any issues with them being repeated anyway). 

The Year Zero presenters seem to be the exception, presumably there was something different in their contracts. And permission was needed for the UK Gold repeats (where Mike Smith and Noel Edmonds refused)- but again that was 30 years ago under a different set of circumstances.