This might help.

I had a wedding client who worked for PRS, so I thought what a good time to create a wedding slide show and add popular music to it and see what she says......nothing.....

I questioned her about it, and her reply was that they are really not interested in the small fry. If you were making 5,000 copies of your film and sending it out, they might sniff at it, 10,000 they would make a report and 25,000 they would get in touch with you. As long as you are not directly making money by selling the dvd's of your films,a dn just using them as promo material they really dont mind....

the artist may get a little upset, but that would be down to them to start the claim via PRS and they woudl have justify the cost of doing so.

None of this is gospel and was a conversation with a client who worked for them, so use it as you wish, but always be carefull.