Let me clarify my answer in the light of Buenchico's post -
he is absolutely correct in his response, but as I mentioned, it is extremely unlikely that the PRS will even hear about this endevour, unless your are shipping thousands of copies. They tend to spend their time going after the bulk-copying merchants who are making serious money, and denying serious money to copyright holders.
Your friend must decide if the risk, minimal though it is, it's still a risk, is worth the result.
Remember, pleading ignorance is no defence in law, neither is copyright theft in the name of a good cause.