Sharyn, I think the actual title is We'll Sing Hallelujah - I could be wrong, but try looking up under that spelling.

Also go to

http://www.prsformusic.com/Pages/Rights.aspx

(it used to be www.mcps-prs-alliance.co.uk)

which now seems to be the website for the PRS-MCPS Alliance, and ask someone there. Richard Thompson is British and that's an old song, probably from before he moved to California (not sure) so maybe the original rights are lodged in the UK.

I have a feeling that legally you will have to pay royalties, whatever the artist says, but I could be wrong. That's another query to put to MCPS because it may be different in Britain, if that's where the original publishing resides. Let us know how you get on -