I've yet to post my thoughts on the whole set...or at least I don't think I have. Anyway, just with regards to the cut music...
The following comes from the FAQ section of a Technical Forum for a BBC TV series...
The question was along the lines of "Why is there such a problem with the uses of copyright music with BBC shows unlike non-BBC shows made by companies such as ITC?"
The answer was "When most BBC TV shows were made the rights for the use of a particular piece of music were negotiated on the basis of use for one transmission and possibly one repeat, without a view on the worldwide market. ITC supplied a worldwide market, and the rights for the clips were negotiated for use in perpetuity, or at least for a very long time."
Of course, ITC no longer exists and most of their archive is now owned by Granada International, with the exception of some shows including The Muppet Show. Now here's the thing, I strongly suspect that if TMS was part of Granda International there would be no problem and the songs could have been released. Sadly because they have changed ownership over the years the rights have to be renegotiated and therefore we have the situation as it is right now.