I guess MCPS is an acronym that no longer has a name, or at least its name isn't listed on the home page of its Website, http://www.prsformusic.com/. Here's what the Website says:

PRS for Music is the home of PRS and MCPS, representing the rights of over 100,000 members in the UK. We license organisations to play, perform or make available copyright music on behalf of our members and those of overseas societies, distributing the royalties to them fairly and efficiently. We promote and protect the value of copyright.

It doesn't say what PRS is, either.

I hate acronyms.

But the Website does appear to offer the help you need in getting permissions, once you get past the acronymns....IMHO.

-Joe-

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Yes, I know:

PRS=Performing Right Society
MCPS=Mechanical Copyright Protection Society