I have Shada where Tom Baker did the hosting...
I have heard the radio version and taped that as they were doing it on BBC-WS
I think he has done several of them.
Yes, McGann has done quite a few for a company called Big Finish, that has done quite a lot of sci fi audio of classic series such as Saphire and Steel, Doctor Who, Adventures of Sarah Jane, etc.
I have 'em all digitized on my computer...