Surely the sound archive is likely to be out of copyright qua sound recording, isn't it, if early Cliff Richard already is?

And since the recordings were of folk songs, the words and tunes will be out of copyright too, no?

And the civil rights of performers eventually having been found to have been inherent under the Performers' Protection Acts 1958-72 will surely also have expired, no?

So copyright in the sound archive ought not to be an issue (and there are provisions about desgnated archives too). And if the digitised collection was put on line, with associated modern performances of the songs in question donated by eager performers, securely, on a subscription basis, then there might be a revenue stream....