Thank you all so much, you have come up trumps. This whole thing is beginning to look bigger than Ben Hur.....the librarian has contacted the music department (it's quite a large school, we have departments all up and down the street) and suggested that the girls could sing some suitably aquatic songs as part of the hooley. Schubert's Trout Quintet springs to mind also - but perhaps not the Eddystone Light.
Alison - you can sing it for me on Friday night!
Cheers
JennieG