Hello Ian. Here's a song I wrote for a friend's wedding: Marjorie's Wedding. It's mostly the tune to the O'Carolan waltz "Fanny Power", with a line of melody borrowed from Ash Grove. If you're interested I can sing it to you over the phone or something.

However, it's written from the point of view of one of the couple rather than a best man's wishes. I'll try to think of something good from a third party point of view.

Marion